Word Origin & History
mare (1)
"female horse," O.E. mere (Mercian), myre (W.Saxon), fem. of O.E. mearh "horse," from P.Gmc. *markhjon (cf. O.S. meriha, O.N. merr, O.Fris. merrie, Ger. Mähre "mare"), said to be of Gaulish origin (cf. Ir. and Gael. marc, Welsh march, Bret. marh "horse"). No known cognates beyond Gmc. and Celtic. As the name of a throw in wrestling, it is attested from 1602. Mare's nest "illusory discovery, excitement over something which does not exist" is from 1619.