Ac - Definition
ac
n 1: a radioactive element of the actinide series; found in
uranium ores [syn: actinium, Ac, atomic number 89]
2: an electric current that reverses direction sinusoidally; "In
the US most household current is AC at 60 cycles per second"
[syn: alternating current, AC, alternating electric
current] [ant: DC, direct current, direct electric
current]