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trifocal

[trahy-foh-kuh l, trahy-foh-]
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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.
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noun
  1. 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. 2018

British Dictionary definitions for trifocal

trifocal

adjective (traɪˈfəʊkəl)
  1. having three focuses
  2. having three focal lengths
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noun (traɪˈfəʊkəl, ˈtraɪˌfəʊkəl)
  1. (plural) glasses with trifocal lenses
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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