| 单词 | dioptre |
| 释义 | Word Frequency dioptre or US diopter (daɪˈɒptə) noun a unit for measuring the refractive power of a lens: the reciprocal of the focal length of the lens expressed in metres Derived forms dioptral (diˈoptral) adjective Word origin C16: from Latin dioptra optical instrument, from Greek, from dia- through + opsesthai to see |
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