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Dioptra

Source : Webster's Revised Unabridged Dictionary (1913)

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