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διόπτρ-α , ἡ,
A.optical instrument for measuring angles, altitudes, etc., Euc.Phaen.p.10M., Plb.10.46.1, Attal. ap. Hipparch.1.10.24, Gem. 1.4, Ptol.Alm.5.14, etc.; “ἡ τῶν δ. θεωρία” Gem.5.11.
2. aperturesight in a torsion-engine, Ph.Bel.64.9, 76.48.
II. plate of talc for glazing windows, Str.12.2.10.
III. = διαστολεύς, Aët.16.89, Paul.Aeg.6.73.
IV. σημεῖον ἐν θυτικῇ, Hsch.
Henry George Liddell. Robert Scott. A Greek-English Lexicon. revised and augmented throughout by. Sir Henry Stuart Jones. with the assistance of. Roderick McKenzie. Oxford. Clarendon Press. 1940.

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