Origin: L, a petty king, prince, dim. Of rex, regis, a king: cf. F. Regule. See Regal.
The name was introduced by the alchemists, and applied by them in the first instance to antimony. I signifies little king; and from the facility with which antimony alloyed with gold, these empirical philosophers had great hopes that this metal, antimony, would lead them to the discovery of the philosopher's stone.