Fresnel LensAn optical device for concentrating light that is made of concentric rings that are faced at different angles so that light falling on any ring is focused…
Fresnel reflectionIn optics, the reflection of a portion of incident light at a discrete interface between two media having different refractive indices.
Fresnel zoneIn radio communications, one of a (theoretically infinite) number of a concentric ellipsoids of revolution which define volumes in the radiation pattern…
FRGC (Face Recognition Grand Challenge)A face recognition development program sponsored by the U.S. Government from 2003-2005. For more information visit www.frvt.org/FRGC. See also FERET, FRVT.
FriableA term commonly used to describe a crumb-like callus. In this state, the callus is easily dissected and readily dispersed into single cells or clumps of…
FrictionResistance to motion when one body is sliding or tending to slide over another.
Friction HeadThe energy lost from the movement of a fluid in a conduit (pipe) due to the disturbances created by the contact of the moving fluid with the surfaces of…
Friction LayerSame as Planetary Boundary Layer; the layer within the atmosphere between the earth's surface and 1 km above the surface; this is the layer where friction…
Friction RidgeThe ridges present on the skin of the fingers and toes, and on the palms and soles of the feet, which make contact with an incident surface under normal…
friction velocityA measure of the surface stress reflecting the effects of surface roughness and wind velocity.
Frieze1. The middle horizontal member of a classical entablature, above the architrave and below the cornice. 2.
Fringe benefitsFringe benefits include the opportunity to participate in programs such as: health, life, disability and other insurance plans; retirement and savings…
Frivolous InventionAn invention that lacks utility because it is frivolous. MPEP 706.03(a).
Front clipBeginning at the firewall, the frontmost section of a race car. Holds the engine and its associated electrical, lubricating and cooling apparatus; and the…
Front end loaderA tractor loader that both digs and dumps in front.
Front End RatioA percentage comparing a borrower's total monthly cost to buy a house (mortgage principal and interest, insurance, and real estate taxes) to monthly…
Front MoneyMoney previously deposited in the cage and used by the player to draw markers against.
Front Page DrawingThe drawing selected by the Examiner to appear on the front page of a U.S. patent.
Front steerA race car in which the steering components are located ahead of the front axle.
Front-end loadA sales charge levied on the purchase of mutual fund units.
front-end processor (FEP)A programmed-logic or stored-program device that interfaces data communication equipment with an input/output bus or memory of a data processing computer.
front-end security filter1. [A] security filter logically separated from the remainder of an information system (IS) to protect system integrity.
Front-end/back-endAn Exchange 2000 configuration in which clients access a bank of protocol servers (the front-end) for collaboration information, and these in turn…
front-end/back-end architectureAn Exchange configuration where clients access a bank of protocol servers (the front-end) for collaboration information, and then these servers…
front-to-back ratio1. Of an antenna, the gain in a specified direction, i.e., azimuth, usually that of maximum gain, compared to the gain in a direction 180° from the…
FrontageThe continuous linear distance along any approved way, measured on the street line, between the side lot lines.
Frontal InversionA temperature inversion that develops aloft when warm air overruns the cold air behind a front.
frontal sinus(FRUN-tul SY-nus) A type of paranasal sinus (a hollow space in the bones around the nose).
Frontogenesis1. The initial formation of a front or frontal zone. 2. In general, an increase in the horizontal gradient of an airmass property, principally density…
FrontPage Server ExtensionsA set of programs and scripts that support authoring in Microsoft Office FrontPage and extend the functionality of a Web server.
FrontrunningIf you trade stock or other investments because you know that an upcoming transaction by a third party is likely to affect the market price of the…
Frost(Abbrev. FRST) - Frost describes the formation of thin ice crystals on the ground or other surfaces in the form of scales, needles, feathers, or fans.
Frost actionFreezing and thawing of moisture in materials and the resultant effects on these materials and on structures of which they are a part of with which they…
Frost AdvisoryIssued during the growing season when widespread frost formation is expected over an extensive area.
Frost heaveThe raising of a surface due to the accumulation of ice in the underlying soil or rock.
Frost lineThe greatest depth to which ground may be expected to freeze.
FrostbiteHuman tissue damage caused by exposure to intense cold.
Froude numberThe ratio of inertial forces to gravitational forces in flow. It is also the ratio of the flow velocity to the velocity of a small gravity wave in the…
Frozen AccountAn account on which funds may not be withdrawn until a lien is satisfied and a court order or other legal process makes the account available for…
Frozen DewWhen liquid dew changes into tiny beads of ice. This occurs when dew forms and temperatures later drop below freezing.
frozen recordsA suspension of the records destruction process because of special circumstances such as an audit, court order, or investigation See also destruction hold…
FRS (File Replication Service)A multimaster replication service that is used replicate files and folders between servers. [Exchange 2007]
FRSTFrost- Frost describes the formation of thin ice crystals on the ground or other surfaces in the form of scales, needles, feathers, or fans.
FRUField-Replaceable Unit. Any hardware unit that can be replaced at the customer site.
fruit acid(FROOT A-sid) One of a group of substances that are found in several types of fruit and in milk.
FRVT (Face Recognition Vendor Test)A series of large-scale independent technology evaluations of face recognition systems. The evaluations have occurred in 2000, 2002, and 2005.
FryImmature fish from the time they hatch to the time they become fingerlings.