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dĭoptra , ae, f., = δίοπτρα,
I.an optical instrument to measure the height of places, Vitr. 8, 6; “for measuring the sun's shadow,Plin. 2, 69, 69, § 176.
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  • Cross-references in general dictionaries from this page (1):
    • Vitruvius, On Architecture, 8.6
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