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