diopter的词源

英文词源

dioptre

"A unit of refractive power, which is equal to the reciprocal of the focal length (in metres) of a given lens", Late 16th century (originally as diopter, denoting an alidade): from French, from Latin dioptra, from Greek, from di- 'through' + optos 'visible'. The term was used in the early 17th century to denote an ancient form of theodolite; the current sense dates from the late 19th century.

中文词源

diopter：折射光，屈光度

dia-, 穿过。-opt, 光，看，词源同optical, optician. 用来指折射光，屈光度。

该词的英语词源请访问趣词词源英文版：diopter 词源，diopter 含义。