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Webster 1913 Edition

Dioptra

{

Di-op′ter

, ‖

Di-op′tra

, }

Noun.

[L.

dioptra

, fr. Gr. [GREEK]. See 2d

.]

An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.

Definition 2024

dioptra

dioptra

English

Noun

dioptra

Alternative form of diopter