Protactinium Definition
prōtăk-tĭnē-əm
noun
A rare, radioactive, metallic chemical element, one of the actinides, found in pitchblende: symbol, Pa; at. no. 91
Webster's New World
Synonyms:
- atomic number 91
- p.a.
- protoactinium
Origin of Protactinium
prot(o)– actinium (so called because it decays into actinium)
From American Heritage Dictionary of the English Language, 5th Edition
-
proto- +"Ž actinium.
From Wiktionary
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