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单词 trifocal
释义

WordReference Random House Learner's Dictionary of American English © 2024
tri•fo•cal /traɪˈfoʊkəl, ˈtraɪˌfoʊ-/USA pronunciation   adj. 
  1. Optics(of a lens) having three areas that focus light rays.
  2. (of an eyeglass lens) having three portions, one for near, one for middle, and one for far vision.

n. 
  1. trifocals, [plural] eyeglasses with trifocal lenses.

WordReference Random House Unabridged Dictionary of American English © 2024
tri•fo•cal  (trī fō′kəl, trī′fō′-),USA pronunciation adj. 
  1. [Optics.]having three foci.
  2. (of an eyeglass lens) having three portions, one for near, one for intermediate, and one for far vision.

n. 
  1. trifocals, eyeglasses with trifocal lenses.
  • tri- + focal 1945–50

Collins Concise English Dictionary © HarperCollins Publishers::
trifocal adj /traɪˈfəʊkəl/
  1. having three focuses
  2. having three focal lengths
 n /traɪˈfəʊkəl; ˈtraɪˌfəʊkəl/
  1. (plural) glasses with trifocal lenses
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更新时间：2025/7/23 1:07:31