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There are 4 fifteen-letter words beginning with RADIOP

RADIOPHONICALLY	• radiophonically adv. In a radiophonic manner. • RADIOPHONIC adv. of music, produced electronically; producing electronic music.
RADIOPHOSPHORUS	• radiophosphorus n. Radioactive phosphorus (especially when used as a tracer). • RADIOPHOSPHORUS n. a radioactive isotope of phosphorus.
RADIOPROTECTION	• radioprotection n. Any form of protection against the harmful effects of ionizing radiation, especially caused by natural sources. • RADIOPROTECTION n. protection against the injurious effects of radiation.
RADIOPROTECTIVE	• radioprotective adj. Pertaining to, or offering, radioprotection. • radioprotective n. A radioprotectant. • RADIOPROTECTIVE adj. serving to protect or aiding in protecting against the injurious effect of radiations.

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: 16 words
Scrabble in French: 2 words
Scrabble in Spanish: no word
Scrabble in Italian: 4 words
Scrabble in German: no word
Scrabble in Romanian: 4 words

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