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Definition of Diopra

{ Di*op"ter (?), ||Di*op"tra (?), } n. [L. dioptra, fr. Gr. &?;. See 2d Dioptric.] An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.

- Webster's Unabridged Dictionary (1913)

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The correct Spelling of this word is: Dioptra

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