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Dual-purpose, as lenses
Answer for the clue "Dual-purpose, as lenses ", 7 letters:
bifocal
Alternative clues for the word bifocal
Word definitions for bifocal in dictionaries
WordNet
Word definitions in WordNet
adj. having two foci; "bifocal eyeglasses"
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Bifocal \Bi"fo`cal\, n. [Pref. bi-+ focal.] a bifocal lens.
Wiktionary
Word definitions in Wiktionary
a. 1 (context optics English) Having two focal lengths 2 (context of a correcting lens English) Divided into two parts, one of which corrects for distance vision and the other for near vision
Douglas Harper's Etymology Dictionary
Word definitions in Douglas Harper's Etymology Dictionary
"having two foci," 1844, from bi- + focal .
Usage examples of bifocal.
A frowning middle-aged woman with conspicuously rouged cheeks, chunky bifocal glasses.
Her thinning blue-gray hair was set neatly above a smooth, plump face, broken only by the bifocal spectacles perched low on the bridge of her potato nose.