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There are 4 nine-letter words containing OPTR

CATOPTRIC• catoptric adj. Of, relating to, or produced by mirrors or reflections.
• CATOPTRIC adj. relating to reflection, also CATOPTRICAL.
DIOPTRATE• dioptrate adj. (Entomology) Divided transversely.
• DIOPTRATE adj. of insects, having the compound eye divided transversely.
DIOPTRICS• dioptrics n. Plural of dioptric.
• dioptrics n. The study of the refraction of light, especially by lenses.
• DIOPTRICS n. the study of light refraction.
OPTRONICS• optronics n. Optoelectronics.
• OPTRONICS n. the study or use of devices involving the interaction of electronic and light signals.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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