1

trifocal

adjective tri·fo·cal \ (ˌ)trī-ˈfō-kəl \

Definition of trifocal

:having three focal lengths

First Known Use of trifocal

1826


2

trifocal

noun

Definition of trifocal

1 trifocals plural :eyeglasses with trifocal lenses
2 :a trifocal glass or lens

First Known Use of trifocal

1899


Medical Dictionary

1

trifocal

adjective tri·fo·cal \ (ˈ)trī-ˈfō-kəl \

medical Definition of trifocal

1 :having three focal lengths
2 of an eyeglass lens :having one part that corrects for near vision, one for intermediate vision (as at arm's length), and one for distant vision

2

trifocal

noun

medical Definition of trifocal

1 :a trifocal glass or lens
2 trifocals plural :eyeglasses with trifocal lenses

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