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There are 18 words beginning with OPTO

OPTOACOUSTIC	• optoacoustic adj. (Physics) Describing any of several interactions between light and sound. • OPTOACOUSTIC adj. relating to or combining both vision and hearing.
OPTOELECTRONIC	• optoelectronic adj. Of or pertaining to optoelectronics. • optoelectronic adj. That has both optical and electronic components, especially such components that interact. • OPTOELECTRONIC adj. relating to optoelectronics.
OPTOELECTRONICS	• optoelectronics n. (Physics) The branch of physics that deals with the interaction of light with electronic devices, or… • OPTOELECTRONICS n. a branch of electronics that deals with electronic devices for emitting, modulating, transmitting, and sensing light.
OPTOKINETIC	• optokinetic adj. Of or pertaining to movement of the eyes. • OPTOKINETIC adj. of, relating to, or involving movements of the eyes.
OPTOLOGIES	• OPTOLOGY n. the study of sight.
OPTOLOGIST	• optologist n. One who studies optology. • OPTOLOGIST n. an optician.
OPTOLOGISTS	• optologists n. Plural of optologist. • OPTOLOGIST n. an optician.
OPTOLOGY	• optology n. (Rare) The study of sight. • OPTOLOGY n. the study of sight.
OPTOMETER	• optometer n. An instrument for measuring the focus of the lens of the eye. • OPTOMETER n. an instrument for testing vision.
OPTOMETERS	• optometers n. Plural of optometer. • OPTOMETER n. an instrument for testing vision.
OPTOMETRIC	• optometric adj. Of or pertaining to optometry. • OPTOMETRIC adj. relating to optometry, also OPTOMETRICAL.
OPTOMETRICAL	• optometrical adj. Of or pertaining to optometry. • OPTOMETRICAL adj. relating to optometry, also OPTOMETRIC.
OPTOMETRIES	• OPTOMETRY n. the science of vision and eye-care.
OPTOMETRIST	• optometrist n. A person trained and skilled in examining and testing the eyes for defects, in order to prescribe corrective… • OPTOMETRIST n. an ophthalmic optician; a person qualified to practise optometry.
OPTOMETRISTS	• optometrists n. Plural of optometrist. • OPTOMETRIST n. an ophthalmic optician; a person qualified to practise optometry.
OPTOMETRY	• optometry n. The art and science of vision and eye care. • OPTOMETRY n. the science of vision and eye-care.
OPTOPHONE	• optophone n. A device that transforms light into sound. • optophone n. A device, used by the blind, that scans text and generates a different sound for each character. • OPTOPHONE n. a device transforming light into sound.
OPTOPHONES	• optophones n. Plural of optophone. • OPTOPHONE n. a device transforming light into sound.

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: 105 words
Scrabble in French: 11 words
Scrabble in Spanish: 5 words
Scrabble in Italian: 25 words
Scrabble in German: 1 word
Scrabble in Romanian: 34 words

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