English noun: Ac | |||
1. | Ac (substance) a radioactive element of the actinide series; found in uranium ores | ||
Synonyms | actinium, atomic number 89 | ||
Broader (hypernym) | chemical element, element | ||
Substance meronym | uranium ore | ||
2. | AC (phenomenon) an electric current that reverses direction sinusoidally | ||
Samples | In the US most household current is AC at 60 cycles per second. | ||
Synonyms | alternating current, alternating electric current | ||
Broader (hypernym) | electrical energy, electricity | ||
Antonyms | direct current, direct electric current, dc | ||