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trifocals

From Wiktionary, the free dictionary

English

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Etymology

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English Wikipedia has an article on:
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From tri- + focal (see focus). Coined by John Isaac Hawkins, their inventor, in 1826.

Noun

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trifocals pl (plural only)

  1. (optics) Spectacles with corrective lenses that have three different powers per eye.
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Translations

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