I. mare noun
Etymology: Middle English, from Old English; akin to Old High German mara incubus, Serbo-Croatian mora nightmare
Date: before 12th century
obsolete : an evil preternatural being causing nightmares
II. mare ˈmer noun
Etymology: Middle English, from Old English mere; akin to Old High German merha mare, Old English mearh horse, Welsh march
Date: before 12th century
: a female horse or other equine animal especially when fully mature or of breeding age
III. ma·re ˈmär-(ˌ)ā noun
( plural ma·ria ˈmär-ē-ə ; also ma·res ˈmär-(ˌ)āz)
Etymology: New Latin, from Latin, sea — more at marine
Date: 1860
: any of several mostly flat dark areas of considerable extent on the surface of the moon or Mars