| fresh frozen plasma | The fluid component of blood lacking the cells but containing all the necessary plasma proteins, used to restore the protein clotting factors in some individuals with clotting factor deficiencies. (27 Sep 1997) |
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| fresh water | 1. Water containing no significant amounts of salts, such as rivers and lakes. 2. Of, pertaining to, or living in, water not salt; as, fresh-water geological deposits; a fresh water fish; fresh water mussels. 3. Accustomed to sail on fresh water only; unskilled as a seaman; as, a fresh water sailor. 4. Unskilled; raw. Fresh water soldiers. Source: Websters Dictionary (01 Mar 1998) |
| freshen | 1. To make fresh; to separate, as water, from saline ingredients; to make less salt; as, to freshen water, fish, or flesh. 2. To refresh; to revive. 3. To relieve, as a rope, by change of place where friction wears it; or to renew, as the material used to prevent chafing; as, to freshen a hawse. To freshen ballast, to shift Or restore it. To freshen the hawse, to pay out a little more cable, so as to bring the chafe on another part. To freshen the way, to increase the speed of a vessel. Origin: Freshened; Freshening. Source: Websters Dictionary (01 Mar 1998) |
| freshening | Preparation of an open, partially healed wound for secondary closure by removal of fibrin, granulations, and early scar tissue. (05 Mar 2000) |
| freshness | The state of being fresh. "The Scots had the advantage both for number and freshness of men." (Hayward) "And breathe the freshness of the open air." (Dryden) "Her cheeks their freshness lose and wonted grace." (Granville) Source: Websters Dictionary (01 Mar 1998) |
| freshwater marsh | <ecology> Wetland dominated by herbaceous plants under the influence of fresh water. (09 Oct 1997) |
| Fresnel fringes | <microscopy> A class of diffraction fringes formed when the source of illumination and viewing screen are at a finite distance from a diffracting edge. In the electron microscope these fringes are best seen when the object is slightly out of focus. (05 Aug 1998) |
| Fresnel lantern | A lantern having a lamp surrounded by a hollow cylindrical Fresnel lens. Origin: From Fresnel the inventor, a French physicist. Source: Websters Dictionary (01 Mar 1998) |
| Fresnel lens | <physics> A lens built up, progressively, in zones or steps, each zone with its own individual radius. Considerable spherical correction is attained, and the weight of the lens is greatly reduced. Fresnel lenses were originally designed for lighthouses but they are now attainable for small spotlights, automobile headlights, and similar uses. (05 Aug 1998) |
| Fresnel prism | A prism composed of concentric annular rings. (05 Mar 2000) |
| Fresnel reflection | <microscopy> Process by which radiant flux is reflected from an optically plane boundary between two transparent dielectric materials. (05 Aug 1998) |
| Fresnel, Augustin Jean | <person> French physicist, 1788-1827. See: Fresnel lens, Fresnel prism. (05 Mar 2000) |
| fressreflex | Sucking and chewing movements elicited by stimulation of the face and lips. Origin: Ger fr. Fressen, to feed, said of animals (05 Mar 2000) |
| fret | 1. To devour. "The sow frete the child right in the cradle." (Chaucer) 2. To rub; to wear away by friction; to chafe; to gall; hence, to eat away; to gnaw; as, to fret cloth; to fret a piece of gold or other metal; a worm frets the plants of a ship. "With many a curve my banks I fret." (Tennyson) 3. To impair; to wear away; to diminish. "By starts His fretted fortunes give him hope and fear." (Shak) 4. To make rough, agitate, or disturb; to cause to ripple; as, to fret the surface of water. 5. To tease; to irritate; to vex. "Fret not thyself because of evil doers." (Ps. Xxxvii. 1) Origin: OE. Freten to eat, consume; AS. Fretan, for foretan; pref. For- + etan to eat; akin to D. Vreten, OHG. Frezzan, G. Fressen, Sw. Frata, Goth. Fra-itan. See For, and Eat. 1. Ornamental work in relief, as carving or embossing. See Fretwork. 2. An ornament consisting of smmall fillets or slats intersecting each other or bent at right angles, as in classical designs, or at obilique angles, as often in Oriental art. "His lady's cabinet is a adorned on the fret, ceiling, and chimney-piece with . . . Carving." (Evelyn) 3. The reticulated headdress or net, made of gold or silver wire, in which ladies in the Middle Ages confined their hair. "A fret of gold she had next her hair." (Chaucer) Fret saw, a saw with a long, narrow blade, used in cutting frets, scrolls, etc.; a scroll saw; a keyhole saw; a compass saw. 1. The agitation of the surface of a fluid by fermentation or other cause; a rippling on the surface of water. 2. Agitation of mind marked by complaint and impatience; disturbance of temper; irritation; as, he keeps his mind in a continual fret. "Yet then did Dennis rave in furious fret." (Pope) 3. Herpes; tetter. 4. <chemical> The worn sides of river banks, where ores, or stones containing them, accumulate by being washed down from the hills, and thus indicate to the miners the locality of the veins. Source: Websters Dictionary (01 Mar 1998) |
| frett | <chemical> The worn side of the bank of a river. See: Fret. Source: Websters Dictionary (01 Mar 1998) |