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 ]