n. [ Arum + -oid. ] (Bot.) Any plant of the Arum family (Araceæ); -- have small flowers massed on a spadix surrounded by a large spathe.
Syn. -- arum [ Webster 1913 Suppl. + WordNet 1.5 ]

/mhw>, a. [ Arum + -oid. ] (Bot.) Belonging to, or resembling, the Arum family of plants (Araceae).
Syn. -- araceous [ 1913 Webster ]

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&ymacr_;man to make room or way, fr. rūm room. The final t is perh. for ta, for thou. Cf. Room space. ] Stand off, or begone. [ Obs. ] [ 1913 Webster ]

Aroint thee, witch, the rump-fed ronyon cries. Shak. [ 1913 Webster ]

v. t. To drive or scare off by some exclamation. [ R. ] “Whiskered cats arointed flee.” Mrs. Browning. [ 1913 Webster ]