'Dioptra' definitions:
Definition of '
Dioptra
'
From:
GCIDE
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. [1913 Webster]
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