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There are 12 words beginning with RADIOA

RADIOACTIVE	• radioactive adj. Exhibiting radioactivity. • radioactive adj. (Figurative, rare) Dangerous and disgusting, particularly of people or ideas. • radioactive n. Any radioactive substance.
RADIOACTIVATE	• radioactivate v. To make something radioactive. • RADIOACTIVATE v. to activate by radio.
RADIOACTIVELY	• radioactively adv. Using a radioactive substance. • radioactively adv. Concerning radioactivity. • RADIOACTIVE adv. of, caused by, or exhibiting radioactivity.
RADIOACTIVITY	• radioactivity n. Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from… • radioactivity n. The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc. • RADIOACTIVITY n. the spontaneous decay of the nucleus of an element.
RADIOACTIVATED	• radioactivated v. Simple past tense and past participle of radioactivate. • RADIOACTIVATE v. to activate by radio.
RADIOACTIVATES	• radioactivates v. Third-person singular simple present indicative form of radioactivate. • RADIOACTIVATE v. to activate by radio.
RADIOAUTOGRAPH	• radioautograph n. Autoradiograph. • RADIOAUTOGRAPH n. an autoradiographic record, also AUTORADIOGRAPH.
RADIOACTIVATING	• radioactivating v. Present participle of radioactivate. • radioactivating n. The act of making something radioactive; radioactivation. • radioactivating adj. That makes something radioactive.
RADIOACTIVATION	• radioactivation n. The conversion of something into a radioactive form. • RADIOACTIVATION n. the act of making radioactive.
RADIOACTIVITIES	• radioactivities n. Plural of radioactivity. • RADIOACTIVITY n. the spontaneous decay of the nucleus of an element.
RADIOAUTOGRAPHS	• radioautographs n. Plural of radioautograph. • RADIOAUTOGRAPH n. an autoradiographic record, also AUTORADIOGRAPH.
RADIOAUTOGRAPHY	• radioautography n. Autoradiography. • RADIOAUTOGRAPHY n. the use of radioautographs.

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: 73 words
Scrabble in French: 20 words
Scrabble in Spanish: 8 words
Scrabble in Italian: 67 words
Scrabble in German: no word
Scrabble in Romanian: 48 words

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