It means of luminous rays or luminous (Greek roots), which shines. It is the name of a chemical element, whose symbol is Ac and its atomic number is 89. It is an unstable and radioactive element.
Metallic and radioactive chemical element, symbol Ac. The name is of Greek origin, 945; 954; 964; 953; 957;o 962; it means "of luminous rays", for the brightness that emanated in the darkness.