actinum
Ac Ac n. 1. the chemical symbol for {actinum}, a radioactive element.

Syn: actinium [WordNet 1.5]


The Collaborative International Dictionary of English. 2000.

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  • Ac — n. 1. the chemical symbol for {actinum}, a radioactive element. Syn: actinium [WordNet 1.5] …   The Collaborative International Dictionary of English

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