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bifocal

[bahy-foh-kuh l, bahy-foh-]
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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.
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noun
  1. 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. 2018

Examples from the Web for bifocals

Contemporary Examples

Historical Examples

  • That surprised, him, and he eyed me over the top of his bifocals.

    Cue for Quiet

    Thomas L. Sherred

  • The bifocals had returned to their incongruous perch on the dome of the head.

    The Brain

    Alexander Blade

  • I removed my glasses to make certain (someday I shall simply have to get bifocals) and saw that it was a foreign cookbook.

  • The turnstiles were blocked by a sandwich board: Mickey in a Ben Franklin wig and bifocals, holding a trowel.


British Dictionary definitions for bifocals

bifocals

pl n
  1. a pair of spectacles with bifocal lenses
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bifocal

adjective
  1. optics having two different focuses
  2. relating to a compound lens permitting near and distant vision
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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

Word Origin and History for bifocals

n.

"bifocal spectacles," 1899, see bifocal. Conceived by Benjamin Franklin, but called by him double spectacles.

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bifocal

adj.

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

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Online Etymology Dictionary, © 2010 Douglas Harper

bifocals in Medicine

bifocal

(bī-fōkəl, bīfō′-)
adj.
  1. Having two focal lengths.
  2. Having one section that corrects for distant vision and another that corrects for near vision.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.