natch

n. [ OF. nache fesse, LL. natica, from L. natis the rump, buttocks. Cf. Aitchbone. ] The rump of beef; esp., the lower and back part of the rump. [ 1913 Webster ]

Natch bone, the edgebone, or aitchbone, in beef. [ 1913 Webster ]

n. pl. (Ethnol.) A tribe of Indians who formerly lived near the site of the city of Natchez, Mississippi. In 1729 they were subdued by the French; the survivors joined the Creek Confederacy. [ 1913 Webster ]