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Dictionary

ac•ti•non

Pronunciation: (ak'tu-non"), [key]
—n. Chem.
a chemically inert, gaseous, short-lived isotope of radon that is a member of the actinium series. Symbol: An; at. no.: 86; at. wt.: 219. Also called actinium emanation.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

actinomycosis

actinopod

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