Definitions
from The Century Dictionary.
- noun Plural of
dioptron .
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Alternative form of
diopter .
Etymologies
Sorry, no etymologies found.
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Examples
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His restless fingers found the dioptra lying on the table, and he started to roll the brass tube in his hand.
The Saracen: Land of the Infidel Robert Shea 1963
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