См. также в других словарях:
bifocal — bifocal, ale, aux [ bifɔkal, o ] adj. • v. 1930; de bi et focal ♦ Opt. Qui a deux foyers. Lunettes bifocales, dont le verre est divisé en deux parties, l une pour la vision à distance, l autre pour la vision rapprochée (cf. À double foyer). ●… … Encyclopédie Universelle
bifocal — ► ADJECTIVE ▪ denoting a lens having two parts each with a different focal length, one for distant and one for near vision. ► NOUN (bifocals) ▪ a pair of glasses with bifocal lenses … English terms dictionary
bifocal — adj. Ópt. Que tiene dos focos. Se dice principalmente de las lentes que tienen dos partes, para corregir la visión a corta y a larga distancia … Diccionario de la lengua española
bifocal — Having two foci. * * * bi·fo·cal ( )bī fō kəl adj 1) having two focal lengths 2) having one part that corrects for near vision and one for distant vision <a bifocal eyeglass lens> bifocal n 1) a bifocal glass or lens 2) bifocals pl… … Medical dictionary
bifocal — I. adjective Etymology: International Scientific Vocabulary Date: 1888 1. having two focal lengths 2. having one part that corrects for near vision and one for distant vision < a bifocal eyeglass lens > II. noun Date: 1899 1 … New Collegiate Dictionary
bifocal lens — a lens with two principal focal lengths: the upper part of the lens gives a sharp image of distant objects and the lower part gives a sharp image of near objects, as when reading. Examples are bifocal spectacles, bifocal contact lenses, and… … Medical dictionary
bifocal — adj. & n. adj. having two focuses, esp. of a lens with a part for distant vision and a part for near vision. n. (in pl.) bifocal spectacles … Useful english dictionary
bifocal — ► adjetivo ÓPTICA Que tiene dos focos: ■ gafas bifocales. * * * bifocal adj. Con dos focos. ⊚ Ópt. Se aplica, en particular, a las lentes y, sobre todo, a los cristales correctores de las gafas que tienen una parte para ver bien de lejos y otra… … Enciclopedia Universal
bifocal — /buy foh keuhl, buy foh /, adj. 1. Chiefly Optics. having two foci. 2. (of an eyeglass or contact lens) having two portions, one for near and one for far vision. n. 3. bifocals, bifocal eyeglasses or contact lenses. [1885 90, Amer.; BI 1 + FOCAL] … Universalium
bifocal — adjective denoting a lens having two parts each with a different focal length, one for distant and one for near vision. noun (bifocals) a pair of glasses with bifocal lenses … English new terms dictionary
bifocal — bi•fo•cal [[t]baɪˈfoʊ kəl, ˈbaɪˌfoʊ [/t]] adj. 1) opt having two foci 2) oph (of an eyeglass or contact lens) having two portions, one for near and one for far vision 3) bifocals, bifocal eyeglasses • Etymology: 1885–90, amer … From formal English to slang
