Definition of promethium
English to English noun - a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium
source: WordNet 3.0
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promethium, prime time, promethean, pronotum, perianthium, permeation, promanation, prenotion, pronation, paramitome, parentation, prenomination, premotion, primidone, pyrimidine, pyramidion, premunition, prima donna, premonition, perennation
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