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There are 7 ten-letter words beginning with IRRA

IRRADIANCE	• irradiance n. The act of irradiating; emission of rays of light. • irradiance n. That which irradiates or is irradiated; lustre; splendour; brilliancy. • irradiance n. (Physics) The radiant power received by unit area of surface.
IRRADIANCY	• irradiancy n. Synonym of irradiance. • IRRADIANCY n. the act of irradiating, also IRRADIANCE.
IRRADIATED	• irradiated v. Simple past tense and past participle of irradiate. • irradiated adj. Emitted outwards from a centre like rays. • irradiated adj. (Heraldry) Having rays.
IRRADIATES	• irradiates v. Third-person singular simple present indicative form of irradiate. • IRRADIATE v. to shed light or other rays upon or into.
IRRADIATOR	• irradiator n. A device used to irradiate. • IRRADIATOR n. something or someone that irradiates.
IRRADICATE	• irradicate v. To root deeply. • IRRADICATE v. to fix firmly.
IRRATIONAL	• irrational adj. Not rational; unfounded or nonsensical. • irrational adj. (Mathematics, arithmetic, number theory, not comparable) Of a real number, that cannot be written as… • irrational n. A real number that can not be expressed as the quotient of two integers, an irrational number.

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: 7 words
Scrabble in French: 10 words
Scrabble in Spanish: 18 words
Scrabble in Italian: 24 words
Scrabble in German: no word
Scrabble in Romanian: no word

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