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trifocals

listen to the pronunciation of trifocals
English - English
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
trifocals

    Pronunciation

    Etymology

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