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bifocal

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bi⋅fo⋅cal

  [bahy-foh-kuhl, bahy-foh-]
Use bifocal in a Sentence
–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:
1885–90, Americanism; bi- 1 + focal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Bifocal Contact Lenses
World's largest contact lens store. Free shipping at 1800CONTACTS.com.
www.1800contacts.com
Bifocal Eyeglasses
Discount Prices on All Glasses. Up to 70% Off. Shop Now!
39DollarGlasses.com
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, as an eyeglass lens.

  3. Embodying two distinct and often conflicting goals, interests, or courses of action: "a smoothly functioning bifocal mind" (John McPhee). "A bifocal monetary policy . . . has kept one eye on the money supply and the other on interest rates" (Edward Meadows).

pl.n.   bi·fo·cals (bī'fō'kəlz, bī-fō'-)
Eyeglasses with bifocal lenses.
bi·fo'cal·ism n.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

bifocal 
1888, from bi- + focal (see focus). Conceived by Benjamin Franklin, but called by him double spectacles.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: 1bi·fo·cal
Pronunciation: (')bI-'fO-k&l
Function: adjective
1 : having two focal lengths
2 : having one part that corrects for near vision and one for distant vision bifocal eyeglass lens>

Main Entry: 2bifocal
Function: noun
1 : a bifocal glass or lens
2 bifocals pl : eyeglasses with bifocal lenses
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

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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