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trifocal

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tri⋅fo⋅cal

  [trahy-foh-kuhl, trahy-foh-]
Use trifocal in a Sentence
–adjective
1. Optics. having three foci.
2. (of an eyeglass lens) having three portions, one for near, one for intermediate, and one for far vision.
–noun
3. trifocals, eyeglasses with trifocal lenses.
Origin:
1945–50; tri- + focal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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tri·fo·cal   (trī-fō'kəl, trī'fō'-)   
adj.  

  1. Having three focal lengths.

  2. Having one section that corrects for distant vision, a second section that corrects for medium vision, and a third that corrects for near vision, as an eyeglass lens.

n.  

  1. A lens having three focal lengths.

  2. trifocals Eyeglasses having trifocal lenses.

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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Medical Dictionary

Main Entry: 1tri·fo·cal
Pronunciation: (')trI-'fO-k&l
Function: adjective
1 : having three focal lengths
2 of an eyeglass lens : having one part that corrects for near vision, one for intermediate vision (as at arm's length), and one for distant vision

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