WordNet Search - 3.1
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Noun
S:
(n)
actinium
,
Ac
,
atomic number 89
(a radioactive element of the actinide series; found in uranium ores)
S:
(n)
alternating current
,
AC
,
alternating electric current
(an electric current that reverses direction sinusoidally)
"In the US most household current is AC at 60 cycles per second"