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diopter

4 senses · Free VividLex dictionary · Thesaurus

1. n. Alt. of Dioptra Source: opted
2. n. a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists Source: wordnet
3. An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc. Source: webster
4. n:100 n. a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists Source: ecdict

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From the definitions

equal focal length lens measured measurement meters oculists power reciprocal refractive unit dioptra alt altitudes Hipparchus instrument invented leveling optical taking

Word family

dioptase dioptre dioptres

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