01 n. the chemical symbol for actinum, a radioactive element.
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1.
the chemical symbol for actinum, a radioactive element. Also: actinum
Syn.
actinium
Entry
2 senses · 2 variants
Webster, 1913
Ac
· IPA /ˈeɪsˈiː/
02 n. an electric current that reverses direction sinusoidally. Alternative to direct curent, DC.
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1.
an electric current that reverses direction sinusoidally. Alternative to direct curent, DC.[acron.]
Syn.
alternating current