Definition: Anthonin was a Roman god, associated with rain. Definition: A Roman god, anthonin (anthoninum), "Anthonin" in Latin, meaning "rain," was one of four Roman gods who were commonly called "gods of water." He was also known as the son of Jupiter and Regulus. Anthonin was often depicted holding a shield or spear. Definition: The word 'Anthonin' is derived from the Greek word 'Anton', which means 'rain'. It is an abbreviation for the Latin name Anthoninus, meaning 'anthonine.' In Roman mythology, it was associated with rain and fertility.