trifocals

الإنجليزية - الإنجليزية

تعريف trifocals في الإنجليزية الإنجليزية القاموس.

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

علم أصول الكلمات

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