trifocal
1 of 2adjective
tri·fo·cal (ˌ)trī-ˈfō-kəl 
: having three focal lengths
trifocal
2 of 2noun
1
trifocals plural : eyeglasses with trifocal lenses
2
: a trifocal glass or lens
Word History
First Known Use
Adjective
1826, in the meaning defined above
Noun
1899, in the meaning defined at sense 1
Medical Definition
trifocal 1 of 2
adjective
tri·fo·cal (ˈ)trī-ˈfō-kəl
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
2 of 2noun
1
: a trifocal glass or lens
2
trifocals plural : eyeglasses with trifocal lenses
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