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Complete Definition of "bifocals"

English
Etymology
From bi- + focal (see focus), coined in 1824 by John Isaac Hawkins, inventor of trifocals. When the concept of bifocals was originally conceived by w:Benjamin Franklin|Benjamin Franklin, he called them double spectacles.

Noun
bifocals
wikipedia

  1. (not used in singular) spectacles that have corrective lenses of two different powers; used by people who need both distance and reading glasses

vi:bifocals

Revision and Credits for"bifocals"
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