bifocal en · ADJ
Etymology
By surface analysis, bi- + focal, or, by surface analysis, bi- + foc(us) + -al.
Meanings
-
(not-comparable) Having two focal lengths.
His hair is black and well greased, with individual strands of gray, and he wears wire-rimmed bifocals with a subtle brownish tint.
1992, Neal Stephenson, Snow Crash, page 183:
- (not-comparable, of a correcting lens) Divided into two parts, one of which corrects for distance vision and the other for near vision.
Coordinates
unifocal · quadrifocal · trifocal · confocal · confocal · trifocal · unifocal