Trifocal
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.
adjective (traɪˈfəʊkəl)
1.
having three focuses
2.
having three focal lengths
noun (traɪˈfəʊkəl; ˈtraɪˌfəʊkəl)
3.
(pl) glasses with trifocal lenses
Read Also:
- Trifocal lens
trifocal lens tri·fo·cal lens (trī-fō’kəl, trī’fō’-) n. A lens having one section that corrects for distant vision, a second section that corrects for intermediate vision, and a third that corrects for near vision.
- Trifold
adjective 1. triple; threefold. 2. having three parts: a trifold screen. adjective 1. a less common word for triple adjective having three parts; threefold, triple Usage Note also as noun
- Trifoliate
adjective 1. having three leaflets, lobes, or foils; trefoil. 2. Botany. trifoliolate. adjective 1. having three leaves, leaflike parts, or (of a compound leaf) leaflets
- Trifoliate-orange
noun 1. a spiny, Chinese orange tree, Poncirus trifoliata, used as a stock in grafting and for hedges.
- Trifoliolate
[trahy-foh-lee-uh-leyt] /traɪˈfoʊ li əˌleɪt/ adjective, Botany. 1. having three leaflets, as a compound leaf. 2. having leaves with three leaflets, as a plant.