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trifocal

[ trahy-foh-kuhl, trahy-foh- ]
/ traɪˈfoʊ kəl, ˈtraɪˌfoʊ- /
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See synonyms for: trifocal / trifocals on Thesaurus.com

adjective
Optics. having three foci.
(of an eyeglass lens) having three portions, one for near, one for intermediate, and one for far vision.
noun
trifocals, eyeglasses with trifocal lenses.
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Origin of trifocal

First recorded in 1945–50; tri- + focal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

British Dictionary definitions for trifocal

trifocal

adjective (traɪˈfəʊkəl)
having three focuses
having three focal lengths
noun (traɪˈfəʊkəl, ˈtraɪˌfəʊkəl)
(plural) 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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