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There are 15 words containing OPTR

CATADIOPTRIC	• catadioptric adj. (Optics) Of or pertaining to optical systems that employ both refractive (dioptric) and reflective (catoptric)… • CATADIOPTRIC adj. relating to or employing both reflection and refraction, as in the construction of some long-focal-length photographic lenses, also CATADIOPTRICAL.
CATADIOPTRICAL	• catadioptrical adj. Catadioptric. • CATADIOPTRICAL adj. relating to or employing both reflection and refraction, as in the construction of some long-focal-length photographic lenses, also CATADIOPTRIC.
CATOPTRIC	• catoptric adj. Of, relating to, or produced by mirrors or reflections. • CATOPTRIC adj. relating to reflection, also CATOPTRICAL.
CATOPTRICAL	• catoptrical adj. Alternative form of catoptric. • CATOPTRICAL adj. relating to reflection, also CATOPTRIC.
CATOPTRICS	• catoptrics n. The branch of optics dealing with reflection. • CATOPTRICS n. the branch of optics which is concerned with reflected light.
DIOPTRAL	• dioptral adj. Synonym of dioptric. • DIOPTRAL adj. relating to a diopter, a measure of refractive power.
DIOPTRATE	• dioptrate adj. (Entomology) Divided transversely. • DIOPTRATE adj. of insects, having the compound eye divided transversely.
DIOPTRE	• dioptre n. Alternative spelling of diopter. • DIOPTRE n. a measure of refractive power, also DIOPTER.
DIOPTRES	• dioptres n. Plural of dioptre. • DIOPTRE n. a measure of refractive power, also DIOPTER.
DIOPTRIC	• dioptric adj. Acting as a medium for sight; making use of refraction (Of lenses, etc.). • dioptric adj. (Obsolete) Pertaining to a diopter. • dioptric adj. (Obsolete) Capable of being seen through.
DIOPTRICAL	• dioptrical adj. Alternative form of dioptric. • DIOPTRICAL adj. transparent, also DIOPTRIC.
DIOPTRICALLY	• dioptrically adv. In a dioptric manner. • DIOPTRICAL adv. transparent, also DIOPTRIC.
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.
OPTRONIC	• optronic adj. Optoelectronic. • OPTRONIC adj. pertaining to the science concerned with electronics and light.
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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English Wiktionary: 48 words
Scrabble in French: 16 words
Scrabble in Spanish: 20 words
Scrabble in Italian: 4 words
Scrabble in German: 2 words
Scrabble in Romanian: 37 words

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