Definition of actinium
English to English noun - a radioactive element of the actinide series; found in uranium ores
source: WordNet 3.0 - A supposed metal, said by Phipson to be contained in commercial zinc; -- so called because certain of its compounds are darkened by exposure to light.
source: Webster 1913
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Nearby Word
actinium, actium, actinia, actin, ascidium, actinian, acetin, acetum, action, auction, actinon, achatina, acuition, acuation, acton, austin, act on, assecution, auctioneer, actionable
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