Source : Webster's Revised Unabridged Dictionary (1913)

Aroint \A*roint"\ ([.a]*roint"), interj. [Cf. Prov. E. rynt,
   rynt thee, roynt, or runt, terms used by milkmaids to a cow
   that has been milked, in order to drive her away, to make
   room for others; AS. r[=y]man to make room or way, fr. r[=u]m
   room. The final t is perh. for ta, for thou. Cf. {Room}
   space.]
   Stand off, or begone. [Obs.]

         Aroint thee, witch, the rump-fed ronyon cries. --Shak.

Aroint \A*roint"\, v. t.
   To drive or scare off by some exclamation. [R.] ``Whiskered
   cats arointed flee.'' --Mrs. Browning.