Definitions beginning with G

A dam constructed of concrete and/or masonry which relies on its weight and internal strength for stability. Gravity dams are generally used where the foundation is rock and earthfill in proper quality and quantity is not available. See arch-gravity dam, crib dam, curved gravity dam, cyclopean dam, and hollow gravity dam.

Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Arch-gravity dam, Axis of dam, Curved gravity dam, Double curvature arch dam, Extrados, Gravity arch dam, Heel of dam, Intrados

All > Science > Weather

In hydrologic terms, a concrete structure proportioned so that its own weight provides the major resistance to the forces exerted on it.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Arch dam, Crest, Crest Width, Design Criteria, Flood Wave, Floodwall, Freeboard, Levee, Navigation Methods, Parapet wall

Gravity irrigation - permalink - collapse

All > Science > Water

Irrigation method that applies irrigation water to fields by letting it flow from a higher level supply canal through ditches or furrows to fields at a lower level.

Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Gabion, Siphon, Siphon tube

Gravity wave - permalink - collapse

All > Science > Climate Change

Gravity wave (gravitational wave) A wave disturbance in which buoyancy (or reduced gravity) acts as restoring force on parcels displaced from hydrostatic equilibrium. There is a direct oscillatory conversion between potential and kinetic energy in the wave motion.
NSIDC - Cite This Source - This Definition
Browse Related Terms: Commercial sector, Economy, Flaring, Residential sector

All > Science > Weather

A wave created by the action of gravity on density variations in the stratified atmosphere. A generic classification for lee waves, mountains waves, and many other waves that form in the atmosphere.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Beach Erosion, Capillary Waves, Heat Wave, Kelvin-Helmholtz Waves, Kelvin Waves, LGWV, Pressure Induced Wave, Seiche, Tidal Piling, Tidal Wave, Wave Crest, Wave Period, Wave Spectrum, Whitecap, WV

Graybody - permalink - collapse

All > Science > Weather

A hypothetical "body" that absorbs some constant fraction of all electromagnetic radiation incident upon it.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: blackbody, Blackbody Radiation, dispersion, gamma ray, Longwave Radiation, Microwave, Photosphere, radiation, Radiation Laws, Shortwave radiation, ultraviolet radiation, Visual Spectrum, X-Rays

Gray code - permalink - collapse

All > Technology > Telecommunications

A binary code in which consecutive decimal numbers are represented by binary expressions that differ in the state of one, and only one, one bit. Synonym reflected code.
ATIS - Cite This Source - This Definition
Browse Related Terms: binary-coded decimal (BCD), binary-coded decimal (BCD) notation, binary-coded decimal code, binary-coded decimal interchange code, binary-coded decimal representation, dotted decimal notation, EBCDIC, extended binary coded decimal interchange code, two-out-of-five code

gray elm - permalink - collapse

All > Medicine > Cancer

The inner bark of this plant has been used in some cultures to treat certain medical problems. It may have antioxidant effects. Also called Indian elm, red elm, slippery elm, sweet elm, Ulmus fulva, and Ulmus rubra.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: Indian elm, red elm, slippery elm, sweet elm, Ulmus fulva, Ulmus rubra

grayline - permalink - collapse

All > Recreation > Fishing

The grayline on a fish finder lets you distinguish between strong and weak echoes. For instance, a soft, muddy or weedy bottom returns a weaker symbol, which is shown with a narrow or no gray line. A hard bottom returns a strong signal, which causes a wide and dark grayline.
AZGFD - Cite This Source - This Definition
Browse Related Terms: Bass Assassin, cowbells, Crickhopper, Curly Tail, curly-tailed grub, jerkbait, pick-up, Sassy Shad, Slug-Go

grayling - permalink - collapse

All > Recreation > Fishing

A northern species of freshwater game fish; a member of the trout family. In Arizona, typically found at Lee Valley Lake in the White Mountains.
AZGFD - Cite This Source - This Definition
Browse Related Terms: Apache trout, brookie, brookies, brook trout, brown trout, crayfish or crawfish, cutthroat trout or cutthroat, desert sucker, Gila trout, Lees Ferry, live baitfish, nonnative fish, rainbow trout, rainbows

Grayscale - permalink - collapse

All > Law > E-Discovery

An image type that uses black, white, and shades of gray to represent an image. Generally, the greater the number of shades of grey, the better the image will look, and the larger the file will be.
Lexbe LC. - Cite This Source - This Definition
Browse Related Terms: Bi-Tonal, Continuous Tone, De-shading, Gray Scale, Scale-to-Gray

Gray Scale - permalink - collapse

All > Law > E-Discovery

The use of many shades of gray to represent an image. Continuous-tone images, such as black-and-white photographs, use an almost unlimited number of shades of gray. Conventional computer hardware and software, however, can only represent a limited number of shades of gray (typically 16 or 256).
AmDoc - Cite This Source - This Definition
Browse Related Terms: Bi-Tonal, Continuous Tone, De-shading, Grayscale, Scale-to-Gray

All > Technology > Telecommunications

An optical pattern consisting of discrete steps or shades of gray between black and white.
ATIS - Cite This Source - This Definition
Browse Related Terms: contrast, optical character reader (OCR), optical character recognition (OCR)

Gray water - permalink - collapse

All > Science > Water

Wastewater other than sewage, such as sink and bath drainage or washing machine discharge.

Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Agricultural drainage, Drainage, Drainage system, Hydrography, Hydrologic unit code, Internal drainage

GRC - permalink - collapse

All > Technology > Defense

General Research Corporation.
DoD Missile Defense Agency - Cite This Source - This Definition
Browse Related Terms: AGARD, ASN(RD&A), DERA, FFRDC, IR&D, IRAD, NRaD, PRDA, R&D, RDA, RDC, SARDA

GRDL - permalink - collapse

All > Science > Weather

Gradual
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Atmospheric Boundary Layer, BL, Boundary Layer, Summation Principle

great circle - permalink - collapse

All > Technology > Telecommunications

A circle defined by the intersection of the surface of the Earth and any plane that passes through the center of the Earth. Note: On the idealized surface of the Earth, the shortest distance between two points lies along a great circle.
ATIS - Cite This Source - This Definition
Browse Related Terms: deep space, nautical mile (nmi), radian (rad.), statute mile

Great Circle Track - permalink - collapse

All > Science > Weather

A great-circle track is the shortest distance between two points on a sphere, and when viewed on a 2-dimensional map the track will appear curved. Swell waves travel along routes that mark out great circles.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Anthelion, BR, LAT, Latitude, RDS