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trifocal
tri·fo·cal T0354900 (trī-fō′kəl, trī′fō′-)adj.1. Having three focal lengths.2. 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.n.1. A lens having three focal lengths.2. trifocals Eyeglasses having trifocal lenses.trifocal adj 1. (Mathematics) having three focuses 2. (General Physics) having three focal lengths n (Medicine) (plural) glasses with trifocal lenses tri•fo•cal (traɪˈfoʊ kəl, ˈtraɪˌfoʊ-)
adj. 1. (of a lens) having three foci. 2. (of an eyeglass lens) having three portions, one for near, one for intermediate, and one for far vision. n. 3. trifocals, eyeglasses with trifocal lenses. [1945–50] Translationstrifocal
tri·fo·cal (trī'fō-kăl), Having three foci. See: trifocal lens. trifocal (trī-fō′kəl, trī′fō′-)adj.1. Having three focal lengths.2. 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.n.1. A lens having three focal lengths.2. trifocals Eyeglasses having trifocal lenses.trifocal 1. Having three focal lengths. 2. Distance-viewing spectacles having additional segments for intermediate and close ranges. |