trifocal
[ trahy-foh-kuh l, trahy-foh- ]
/ traɪˈfoʊ kəl, ˈtraɪˌfoʊ- /
adjective
Optics.
having three foci.
(of an eyeglass lens) having three portions, one for near, one for intermediate, and one for far vision.
noun
trifocals,
eyeglasses with trifocal lenses.
Words nearby trifocal
British Dictionary definitions for trifocal
trifocal
adjective (traɪˈfəʊkəl)
having three focuses
having three focal lengths
noun (traɪˈfəʊkəl, ˈtraɪˌfəʊkəl)
(plural)
glasses with trifocal lenses