1

trifocal

adjective tri·fo·cal \ (ˌ)trī-ˈfō-kəl \
|Updated on: 12 Jun 2018

Definition of trifocal

: having three focal lengths

First Known Use of trifocal

1826

in the meaning defined above

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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

in the meaning defined at sense 1

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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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