bifocal

[ bahy-foh-kuh l, bahy-foh- ]
/ baɪˈfoʊ kəl, ˈbaɪˌfoʊ- /

adjective

Chiefly Optics. having two foci.
(of an eyeglass or contact lens) having two portions, one for near and one for far vision.

noun

bifocals, bifocal eyeglasses or contact lenses.

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Origin of bifocal

An Americanism dating back to 1885–90; bi-1 + focal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for bifocals

British Dictionary definitions for bifocals (1 of 2)

bifocals
/ (baɪˈfəʊkəlz) /

pl n

a pair of spectacles with bifocal lenses

British Dictionary definitions for bifocals (2 of 2)

bifocal
/ (baɪˈfəʊkəl) /

adjective

optics having two different focuses
relating to a compound lens permitting near and distant vision
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for bifocals

bifocal
[ bī-fōkəl, bīfō′- ]

adj.

Having two focal lengths.
Having one section that corrects for distant vision and another that corrects for near vision.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.