Definition of "radioisotope" [radioisotope]

• A naturally or artificially produced radioactive isotope of an element. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The NASA probes use so-called radioisotope thermoelectric generators (RTGs) which transform heat emitted from naturally decaying plutonium into electricity."
• "The NASA probes use so-called radioisotope thermoelectric generators"
• "Gary Bennett considers the more conventional power plants, such as radioisotope thermoelectric generators and fusion systems."