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There are 8 words beginning with OPSI

OPSIN	• opsin n. (Biochemistry) Any of a group of light-sensitive proteins in the retina. • OPSIN n. a protein which forms part of the visual pigment rhodopsin.
OPSINS	• opsins n. Plural of opsin. • OPSIN n. a protein which forms part of the visual pigment rhodopsin.
OPSIMATH	• opsimath n. (Rare) A person who learns late in life. • OPSIMATH n. one who learns late in life.
OPSIMATHS	• opsimaths n. Plural of opsimath. • OPSIMATH n. one who learns late in life.
OPSIMATHY	• opsimathy n. Learning or education that occurs late in life. • OPSIMATHY n. education late in life.
OPSIOMETER	• opsiometer n. An old instrument for measuring vision and determining the focal length of a lens that can correct an… • OPSIOMETER n. an instrument for testing vision.
OPSIMATHIES	• OPSIMATHY n. education late in life.
OPSIOMETERS	• opsiometers n. Plural of opsiometer. • OPSIOMETER n. an instrument for testing vision.

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 1Word.ws and WikWik.org.

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English Wiktionary: 11 words
Scrabble in French: 2 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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