trifocals

- 3 dictionary results

tri⋅fo⋅cal

[trahy-foh-kuh

l, trahy-foh-]

–adjective

1.	Optics. having three foci.

2.	(of an eyeglass lens) having three portions, one for near, one for intermediate, and one for far vision.

–noun

3.	trifocals, eyeglasses with trifocal lenses.

Origin:
1945–50; tri- + focal

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2010.
Cite This Source

tri·fo·cal (trī-fō'kəl, trī'fō'-)

adj.

Having three focal lengths.
Having one section that corrects for distant vision, a second section that corrects for medium vision, and a third that corrects for near vision, as an eyeglass lens.

Medical Dictionary

Main Entry: ²trifocal
Function: noun
1 : a trifocal glass or lens
2 trifocals pl : eyeglasses with trifocal lenses

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