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Dionysiac
Dionysian
dionysian
Dionysus
Diophantine equation
diopside
diopter
dioptric
dioptrics
diorama
diorite
Dioscuri
dioxane
dioxide
dioxin
dip
dip.
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dioptrics
di·op·trics [ dī óptriks ]


noun 
Definition:
 
study of refraction of light: the branch of optics that studies the refraction of light by lenses or within the eye ( takes a singular verb )

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