manslaughter (n.) Look up manslaughter at Dictionary.com
mid-14c., " act, crime, or sin of killing another human being," in battle or not, from man (n.) + slaughter (n.). Replaced Old English mannslæht (Anglian), mannslieht (West Saxon), from slæht, slieht "act of killing" (see slay); Middle English also had man-quelling "murder, homicide" (late 14c.). Etymologically identical with homicide, but in legal use usually distinguished from murder and restricted to "simple homicide."