Quadrans
The fourth part of the As. It bears on the obverse the head of Hercules and on the reverse the prow of a galley. On each side are three bosses, indicating its weight of three ounces. See Aes Grave, and Vierer.
Synonyms: Teruncia
Source: Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)