zodiac constellation usually identified as "the Ram," late Old English, from Latin aires "ram" (related to arietare "to butt"), from a PIE root meaning "spring, jump" (cognates: Lithuanian erytis, Old Church Slavonic jarici, Armenian oroj "lamb;" Greek eriphos, Old Irish heirp "kid"). Meaning "person born under the sign of Aries" is from 1894; they also have been called Arian (1917).
