Etymology
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bifocals (n.)

"bifocal spectacles," 1883, bi-focals; see bifocal. Invented by Benjamin Franklin, but he called them double spectacles.

updated on May 26, 2017

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Definitions of bifocals from WordNet

bifocals (n.)
(plural) eyeglasses having two focal lengths, one for near vision and the other for far vision;
From wordnet.princeton.edu, not affiliated with etymonline.