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the Week of Proper 8 / Ordinary 13
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Bible Dictionaries
Dioptra

Webster's Dictionary

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

Bibliography Information
Webster, Noah. Entry for 'Dioptra'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​d/dioptra.html. 1828.
 
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