Word:

Diopter

Di`op´ter
n.1.An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.
Noun1.diopter - a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters
unit, unit of measurement
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Dionaea
Dionaea muscipula
Dionysia
Dionysiac
Dionysian
Dionysian period
Dionysius
Dionysius the Elder
Dionysus
dioon
Diophantine
Diophantine analysis
Diophantine equation
Diophantus
Diopside
Dioptase
-- Diopter --
Dioptre
Dioptric
Dioptric curve
Dioptrics
Dioptry
Dior
Diorama
Dioramic
Diorism
Dioristic
Diorite
Dioritic
Diorthotic
Dioscorea
Dioscorea alata
Dioscorea batata
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