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单词 diopter
释义

WordReference Random House Unabridged Dictionary of American English © 2024
di•op•ter  (dī optər),USA pronunciation n. 
  1. Opticsa unit of measure of the refractive power of a lens, having the dimension of the reciprocal of length and a unit equal to the reciprocal of one meter. Abbr.: D
  2. Antiquityan instrument, invented by Hipparchus, to measure the apparent diameter of the sun or moon or to estimate the size or elevation of distant objects.
Also,[esp. Brit.,] di•optre. 
  • Greek: instrument for measuring height or levels, equivalent. to di- di-3 + op- (for ópsesthai to see) + -tra noun, nominal suffix of means
  • Latin dioptra
  • 1585–95
di•optral, adj. 

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