trifocals

English - English

Definition of trifocals in English English dictionary

Spectacles with corrective lenses that have three different powers per eye

{i} eyeglasses with trifocal lenses, eyeglasses having lenses with three focal lengths

spectacles that have corrective lenses of three different powers for each eye

Etymology

() From tri- + focal (see focus). Coined by John Isaac Hawkins, their inventor, in 1826.