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bifocal

[bahy-foh-kuh l, bahy-foh-] /baɪˈfoʊ kəl, ˈbaɪˌfoʊ-/
adjective
1.
Chiefly Optics. having two foci.
2.
(of an eyeglass or contact lens) having two portions, one for near and one for far vision.
noun
3.
bifocals, bifocal eyeglasses or contact lenses.
Origin
1885-1890
1885-90, Americanism; bi-1 + focal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for bi-focal

bifocal

/baɪˈfəʊkəl/
adjective
1.
(optics) having two different focuses
2.
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
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Word Origin and History for bi-focal

bifocal

adj.

"having two foci," 1844, from bi- + focal.

Online Etymology Dictionary, © 2010 Douglas Harper
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bi-focal in Medicine

bifocal bi·fo·cal (bī-fō'kəl, bī'fō'-)
adj.

  1. Having two focal lengths.

  2. 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.
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