dioptric /dī-opˈtrik/ or dioptrical /-kəl/

1. Relating to dioptrics or a diopter
2. Transparent (as in dioptric beehive)

diopˈter noun

1. An ancient form of theodolite
2. The index-arm of a graduated circle
3. A dioptre (esp US)

diopˈtrate adjective (zoology)

Having the compound eye divided transversely

diopˈtre noun

A unit of measurement of the power of a lens, the reciprocal of the focal distances in metres, negative for a divergent lens

diopˈtrics singular noun

The part of optics that deals with refraction

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