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Dionysius of Alexandria
Dionysius of Halicarnassus
Dionysius the Elder
Dionysus
dioon
Diophantine
Diophantine analysis
Diophantine equation
Diophantus
Diopside
diopsidic
Dioptase
diopter
dioptre
Dioptric
Dioptric curve
Dioptrical
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Dior
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1910

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Webster's 1913 Dictionary

Diopter 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.





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