Fresnel lens
Fres′nel″ lens″ (?). [See Fresnel lamp.] (Optics) See under Lens.
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.
4.505 entries
Fres′nel″ lens″ (?). [See Fresnel lamp.] (Optics) See under Lens.
Fret (frĕt), n. See 1st Frith.
Fret (frĕt), v. t. [imp. & p. p.Fretted; p. pr. & vb. n.Fretting.] [OE. freten to eat, consume; AS. fretan, for foretan; pref. for- + etan to eat; akin to D. vreten, OHG. frezza...
Fret, v. i. 1. To be worn away; to chafe; to fray; as, a wristband frets on the edges.2. To eat in; to make way by corrosion.Many wheals arose, and fretted one into another with...
Fret, n. 1. The agitation of the surface of a fluid by fermentation or other cause; a rippling on the surface of water. Addison.2. Agitation of mind marked by complaint and impa...
Fret, v. t. [OE. fretten to adorn, AS. frætwan, frætwian; akin to OS. fratahōn, cf. Goth. us-fratwjan to make wise, also AS. frætwe ornaments, OS. fratahī adornment.] To ornamen...
Fret, n. 1. Ornamental work in relief, as carving or embossing. See Fretwork.2. (Arch.) An ornament consisting of small fillets or slats intersecting each other or bent at right...
Fret (?), n. [F. frette a saltire, also a hoop, ferrule, prob. a dim. of L. ferrum iron. For sense 2, cf. also E. fret to rub.] 1. (Her.) A saltire interlaced with a mascle.2. (...
Fret, v. t. To furnish with frets, as an instrument of music.
Fret″ful (?), a. [See 2d Fret.] Disposed to fret; ill-humored; peevish; angry; in a state of vexation; as, a fretful temper. — Fret″ful‐ly, adv. — Fret″ful‐ness, n.Syn. — Peevis...
Frett (?), n. [See 2d Fret.] (Mining) The worn side of the bank of a river. See 4th Fret, n., 4.
Frett, n. [See Frit.] A vitreous compound, used by potters in glazing, consisting of lime, silica, borax, lead, and soda.
Fret″ted (?), p. p. & a. [From 2d Fret.]1. Rubbed or worn away; chafed.2. Agitated; vexed; worried.
Fret″ted, p. p. & a. [See 5th Fret.] 1. Ornamented with fretwork; furnished with frets; variegated; made rough on the surface.2. (Her.) Interlaced one with another; — said of ch...
Fret″ten (?), a. Rubbed; marked; as, pock-fretten, marked with the smallpox. Wright.
Fret″ter (?), n. One who, or that which, frets.
Fret″ty, a. [See 5th Fret.] Adorned with fretwork.
‖Fre″tum (?), n.; pl.Freta (#). A strait, or arm of the sea.
Fret″work (?), n. [6th fret + work.] Work adorned with frets; ornamental openwork or work in relief, esp. when elaborate and minute in its parts. Hence, any minute play of light...
Frey″a (frī″ȧ), n. [Icel. Freyja.] (Scand. Myth.) The daughter of Njörd, and goddess of love and beauty; the Scandinavian Venus; — in Teutonic myths confounded with Frigga, but ...
Fri″a‐bii″i‐ty (?), n. [Cf. F. friabilité.] The quality of being friable; friableness. Locke.
Fri″a‐ble (?), a. [L. friabilis, fr. friare to rub, break, or crumble into small pieces, cf. fricare to rub, E. fray: cf. F. friable.] Easily crumbled, pulverized, or reduced to...
Fri″ar (?), n. [OR. frere, F. frère brother, friar, fr. L. frater brother. See Brother.] 1. (R. C. Ch.) A brother or member of any religious order, but especially of one of the ...
Fri″ar‐ly, a. Like a friar; inexperienced. Bacon.
Fri″ar‐y (?), a. [From Friar, n.] Like a friar; pertaining to friars or to a convent. Camden.
Fri″ar‐y, n. [OF. frerie, frairie, fr. frère. See Friar.] 1. A monastery; a convent of friars. Drugdale.2. The institution or practices of friars. Fuller.
Fri‐a″tion (?), n. [See Friable.] The act of breaking up or pulverizing.