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promethium

Noun

pro=me=thi=um

WORDNET DICTIONARY

promethium(n = noun.substance) atomic number 61, pm - 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; Array

is a kind of metal, metallic element

promethium, n. Chem. a radioactive metallic element of the lanthanide series occurring in nuclear-waste material.

Usage

Symb.: Pm.

Etymology

Prometheus: see PROMETHEAN