trifocal

[ trahy-foh-kuh l, trahy-foh- ]
/ traɪˈfoʊ kəl, ˈtraɪˌfoʊ- /

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. 2020

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