trifocal

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

Definition of trifocal 

(Entry 1 of 2)

: having three focal lengths

trifocal

noun

Definition of trifocal (Entry 2 of 2)

1 trifocals plural : eyeglasses with trifocal lenses

2 : a trifocal glass or lens

First Known Use of trifocal

Adjective

1826, in the meaning defined above

Noun

1899, in the meaning defined at sense 1

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The first known use of trifocal was in 1826

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More Definitions for trifocal

trifocal

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

Medical Definition of trifocal 

(Entry 1 of 2)

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

trifocal

noun

Medical Definition of trifocal (Entry 2 of 2)

1 : a trifocal glass or lens

2 trifocals plural : eyeglasses with trifocal lenses

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