Definitions beginning with G

gastropod - permalink - collapse

All > Science > Climate Change

a member of the class of mollusks that includes snails.
NCDC National Climatic Data Center - Cite This Source - This Definition
Browse Related Terms: Accuracy, Air temperature, Hygrometer, Instrument shelter, instrumental record, Psychrometer, Scale, Shield, Thermograph, Thermometer

gastroscope - permalink - collapse

All > Medicine > Cancer

(GASS-troh-SKOPE) A thin, tube-like instrument used to examine the inside of the stomach. A gastroscope has a light and a lens for viewing and may have a tool to remove tissue.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: bronchoscope, Colonoscope, cystoscope, endoscope, laparoscope, laryngoscope, mediastinoscope, nasoscope, resectoscope, rhinoscope, Sigmoidoscope, thoracoscope

gastroscopy - permalink - collapse

All > Medicine > Cancer

(gas-TROS-koh-pee) Examination of the inside of the stomach using a gastroscope passed through the mouth and esophagus. A gastroscope is a thin, tube-like instrument with a light and a lens for viewing. It may also have a tool to remove tissue to be checked under a microscope for signs of disease. Also called upper endoscopy.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: bronchoscopy, Colonoscopy, cystoscopy, endoscopy, esophagoscopy, laparoscopic-assisted colectomy, laparoscopic prostatectomy, laparoscopy, mediastinoscopy, nasoscopy, proctoscopy, proctosigmoidoscopy, rhinoscopy, sigmoidoscopy, thoracoscopy, upper endoscopy, ureteroscopy

gastrostomy tube - permalink - collapse

All > Medicine > Cancer

(gas-TROS-toh-mee ...) A tube inserted through the wall of the abdomen directly into the stomach. It allows air and fluid to leave the stomach and can be used to give drugs and liquids, including liquid food, to the patient.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: esophageal, esophageal speech, esophageal stent, esophagitis, esophagus, intraluminal intubation and dilation, nasogastric, tracheoesophageal puncture

gastrula - permalink - collapse

All > Science > Biotechnology and Genetics > Food Biotechnology

An early animal embryo consisting of two layers of cells; an embryological stage following the blastula.
UN Food and Agriculture Organization - Cite This Source - This Definition
Browse Related Terms: blastocyst, blastomere, blastula, epigenesis, foetus, germ layer, mesoderm

All > Science > Biotechnology and Genetics > Stem Cell

Animal embryo at an early stage of development in which cells are enclosed in a sheath to form the beginning of a gut cavity.
DHHS - Cite This Source - This Definition
Browse Related Terms: Blastocoel, blastocyst, blastula, Cleavage, Morula

Gastrulation - permalink - collapse

All > Science > Biotechnology and Genetics > Stem Cell

The process whereby the cells of the blastocyst are translocated to establish three germ layers. Also sometimes used to mark the end of the blastocyst stage and the beginning of the next stage of embryonic development. (Based on SMD)
The President's Council on Bioethics - Cite This Source - This Definition
Browse Related Terms: Anterior visceral endoderm (AVE), Cavitation, Neuroepithelium, Trophectoderm, Zona pellucida

In hydrologic terms, a device in which a leaf or member is moved across the waterway from an external position to control or stop flow. There are many different kinds of gates used on a dam
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Backwater Curve, Backwater Effect, Breach, Control Points, Dam, Dam failure, DAMBRK, Downstream Slope, Emergency Action Plan, Face, Forebay, Jokulhlaup, Phiezometer, Tailwater Height, Toe of Dam, Upstream Slope

All > Technology > Defense

Graphic Analysis Tool Environment.
DoD Missile Defense Agency - Cite This Source - This Definition
Browse Related Terms: AAT, AAT-PP, AdaMAT, BESim /AT, CPAT, KENN, Smart Checklist, st, STWG

All > Technology > Telecommunications

A device having one output channel and one or more input channels, such that the output channel state is completely determined by the input channel states, except during switching transients. 2. One of many types of combinational logic elements having at least two inputs; e.g., AND, OR, NAND, and NOR.
ATIS - Cite This Source - This Definition
Browse Related Terms: combinational logic element, freeze-out, interpolation gain, logical signaling channel, sequential logic element

Gate chamber (valve chamber) - permalink - collapse

All > Science > Water

A chamber in which a guard gate in a pressurized outlet works or both the guard and regulating gates in a free-flow outlet works are located. A room from which a gate or valve can be operated, or sometimes in which the gate is located. Concrete portion of an outlet works containing gates between upstream and downstream conduits and/or tunnels.

Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Access shaft, Balanced head condition, Clam shell gate, Control structure (control house), Emergency gate, Guard gate (emergency), Outlet gate, Outlet Works, Shaft house

Gated pipe - permalink - collapse

All > Science > Water

Portable pipe with small gates installed along one side for distributing irrigation water to corrugations or furrows.

Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Barrage (gate-structure dam), Bascule gate., Best gate, Bulkhead gate, Crest gate (spillway gate), Crest structure, Flap gate, Flood gate, Full gate, Gate hanger, Gate structure, Gated spillway, Sill, Skimmer gate, Tainter gate

Gated spillway - permalink - collapse

All > Science > Water

Overflow section of dam restricted by use of gates that can be operated to control releases from the reservoir to ensure the safety of the dam.

Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Barrage (gate-structure dam), Bascule gate., Best gate, Bulkhead gate, Crest gate (spillway gate), Crest structure, Flap gate, Flood gate, Full gate, Gate hanger, Gate structure, Gated pipe, Sill, Skimmer gate, Tainter gate

Gate hanger - permalink - collapse

All > Science > Water

A device used to maintain a set gate opening.

Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Barrage (gate-structure dam), Bascule gate., Best gate, Bulkhead gate, Crest gate (spillway gate), Crest structure, Flap gate, Flood gate, Full gate, Gate structure, Gated pipe, Gated spillway, Sill, Skimmer gate, Tainter gate

gatekeeper - permalink - collapse

All > Technology > Storage

A small EMC Symmetrix device configured to function as a lock during certain state change operations.
HP - Cite This Source - This Definition
Browse Related Terms: consistency group, ESCON (Enterprise Storage Connect), M by N, PowerPath, R1, R2, SRDF (Symmetrix Remote Data Facility), SymCLI, Symmetrix device number

Gate structure - permalink - collapse

All > Science > Water

Portion of spillway between inlet channel and chute, tunnel or conduit, which contains gates, such as radial gates.

Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Barrage (gate-structure dam), Bascule gate., Best gate, Bulkhead gate, Crest gate (spillway gate), Crest structure, Flap gate, Flood gate, Full gate, Gate hanger, Gated pipe, Gated spillway, Sill, Skimmer gate, Tainter gate

Gate valve - permalink - collapse

All > Science > Water

A valve with a circular-shaped closing element that fits securely over an opening through which water flows. A valve that utilizes a disc moving at a right angle to the flow to regulate the rate of flow. When a gate valve is fully opened, there is no obstruction to the flow.

Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Bonnet, Butterfly valve, Conifers, Ensign valve, Fixed cone valve (Howell Bunger valve), Hollow-jet valve, Howell Bunger valve., Needle valve, Petcock, Regulating gate (operating gate, regulating valve), Relief valve, Tube valve, Valve

Gateway - permalink - collapse

All > Technology > Defense

An element that contained a node on the SDS backbone network as well as on some other network(s) and would have performed protocol and format conversions necessary to accept messages from one network and retransmit them on the other.
DoD Missile Defense Agency - Cite This Source - This Definition
Browse Related Terms: CPP, Engagement Planning, EVPA, KPP, Required Technical Characteristics, SPP, TDK, Technical Parameters (TPs)

All > Technology > E-mail > Microsoft Email > Microsoft Exchange > Microsoft Exchange 5.5

Delivers messages from Exchange to foreign systems. [Exchange 5.5]
Microsoft - Cite This Source - This Definition
Browse Related Terms: foreign system, information service, System attendant

All > Technology > Records Management

Computer hardware and/or software configured to interface between networks that use different protocols
ARMA - Cite This Source - This Definition
Browse Related Terms: API, API (application program interface), electronic mail, Interface, NAS, network architecture

All > Technology > Telecommunications

In a communications network , a network node equipped for interfacing with another network that uses different protocols. Note 1: A gateway may contain devices such as protocol translators, impedance matching devices, rate converters, fault isolators, or signal translators as necessary to provide system interoperability. It also requires that mutually acceptable administrative procedures be established between the two networks. Note 2: A protocol translation/mapping gateway interconnects networks with different network protocol technologies by performing the required protocol conversions. 2. [An] interface providing a compatibility between networks by converting transmission speeds, protocols, codes, or security measures. [INFOSEC-99] 3. Loosely, a computer configured to perform the tasks of a gateway.
ATIS - Cite This Source - This Definition
Browse Related Terms: acoustic coupler, dual-homed Host, JiniTM, network interface device (NID), network side, NID, physical signaling sublayer (PLS)

Gateway Page - permalink - collapse

All > Technology > Search > SEO / Search Marketing

Also called a "doorway page" or a "bridge page". A gateway page is a low quality web page that contains very little content and exists solely for the purpose of driving traffic to another page. This is done through spamdexing, spamming the index of a search engine. Gateway pages are often easy to identify in that they have been designed primarily for search engines, not for human beings.
SEO Glossary.com - Cite This Source - This Definition
A web page submitted to a search engine (spyder) to give the relevance-algorithm of that particular spyder the data it needs, in the format that it needs it, in order to place a site at the proper level of relevance for the topic(s) in question. (This determination of topical relevance is called "placement".)

A gateway page may present information to the spyder, but obscure it from a casual human viewer. The gateway page exists so as to allow a web-site to present one face to the spyder, and another to human viewers. There are several reasons why one might want to do this. One, is that the author may not want to publicly disclose placement tactics. Another is that the format that may be easiest for a given spyder to understand, may not be the format that the author wishes to present to his viewers for aesthetics. Still another may be that the format that is best for one spyder may differ from that which is best for another. By using gateway pages, you can present your site to each spyder in the way which is known or thought to be best for that particular spyder.

Also known as bridge pages, doorway page, entry pages, portals or portal pages.

I-Search Digest - Cite This Source - This Definition
Browse Related Terms: Bridge Page, Doorway Page, Doorway Pages, Multiple Domain Names, Portal Page

gating - permalink - collapse

All > Technology > Telecommunications

The process of selecting only those portions of a wave between specified time intervals or between specified amplitude limits. 2. The controlling of signals by means of combinational logic elements. 3. A process in which a predetermined set of conditions, when established, permits a second process to occur.
ATIS - Cite This Source - This Definition
Browse Related Terms: baud (Bd), chip, direct-sequence spread spectrum, Poisson distribution, pseudorandom number sequence, random number, time-gated direct-sequence spread spectrum, unavailability