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Wordswarms From Years PastAdjacent WordsDionysius of AlexandriaDionysius of Halicarnassus Dionysius the Elder Dionysus dioon Diophantine Diophantine analysis Diophantine equation Diophantus Diopside diopsidic Dioptase diopter dioptre Dioptric Dioptric curve Dioptrical Dioptrics Dioptry Dior diorama dioramic Diorism Dioristic Full-text Search for "Dioptra" 1910 |
Dioptra definitions
Webster's 1913 DictionaryDiopter Di*op"ter, Dioptra Di*op"tra, n. [L. dioptra, fr. Gr. ?. See 2d Dioptric.] An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc. |