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trifocal

[trahy-foh-kuh l, trahy-foh-] /traɪˈfoʊ kəl, ˈtraɪˌfoʊ-/
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
1945-1950
1945-50; tri- + focal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for trifocal

trifocal

adjective (traɪˈfəʊkəl)
1.
having three focuses
2.
having three focal lengths
noun (traɪˈfəʊkəl; ˈtraɪˌfəʊkəl)
3.
(pl) glasses with trifocal lenses
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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13
15
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