bifocal

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]

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Universalium. 2010.

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Look at other dictionaries:

  • bifocal — BIFOCÁL, Ă, bifocali, e, adj. (Despre lentile) Cu două distanţe focale diferite; (despre ochelari) cu lentile bifocale. – Din fr. bifocal. Trimis de paula, 21.06.2002. Sursa: DEX 98  bifocál adj. m., pl. bifocáli; f. sg. bifocálă …   Dicționar Român

  • 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 — Bi fo cal, n. [Pref. bi + focal.] a bifocal lens. [PJC] …   The Collaborative International Dictionary of English

  • 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 — Bi fo cal, a. [Pref. bi + focal.] Having two foci, as some spectacle lenses. [Webster 1913 Suppl.] …   The Collaborative International Dictionary of English

  • bifocal — 1. relativo a o que tiene dos focos. 2. (de una lente) que tiene dos áreas de diferente distancia focal. Diccionario Mosby Medicina, Enfermería y Ciencias de la Salud, Ediciones Hancourt, S.A. 1999 …   Diccionario médico

  • bifocal — (adj.) having two foci, 1844, from BI (Cf. bi ) + focal (see FOCUS (Cf. focus)) …   Etymology dictionary

  • bifocal — adj. 2 g. Que tem dois focos …   Dicionário da Língua Portuguesa

  • bifocal — adjetivo 1. Área: óptica Que tiene dos focos: lentes bifocales …   Diccionario Salamanca de la Lengua Española

  • 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 — ☆ bifocal [bī fō′kəl, bī′fō΄kəl ] adj. adjusted to two different focal lengths n. a lens, esp. for eyeglasses, with one part ground for close focus, as for reading, and the other ground for distance …   English World dictionary

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