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There are 5 fifteen-letter words beginning with RADIOA

RADIOACTIVATINGradioactivating v. Present participle of radioactivate.
radioactivating n. The act of making something radioactive; radioactivation.
radioactivating adj. That makes something radioactive.
RADIOACTIVATIONradioactivation n. The conversion of something into a radioactive form.
RADIOACTIVATION n. the act of making radioactive.
RADIOACTIVITIESradioactivities n. Plural of radioactivity.
RADIOACTIVITY n. the spontaneous decay of the nucleus of an element.
RADIOAUTOGRAPHSradioautographs n. Plural of radioautograph.
RADIOAUTOGRAPH n. an autoradiographic record, also AUTORADIOGRAPH.
RADIOAUTOGRAPHYradioautography 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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