BIFOCAL

bifocal

(adjective) having two foci; “bifocal eyeglasses”

Source: WordNet® 3.1

Etymology

Adjective

bifocal (not comparable)

(optics) Having two focal lengths

(of a correcting lens) Divided into two parts, one of which corrects for distance vision and the other for near vision

Source: Wiktionary

Bi*fo"cal, a. [Pref. bi-+ focal.]

Definition: Having two foci, as some spectacle lenses.

Source: Webster’s Unabridged Dictionary 1913 Edition

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