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more about bifocal
bifocal |
2 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Bifocal \Bi*fo"cal\, a. [Pref. bi-+ focal.] Having two foci, as some spectacle lenses. From WordNet r 1.6 [wn]: bifocal adj : (optics) having two foci; "bifocal eyeglasses"
more about bifocal