| Noun | 1. | Arisarum - tuberous or rhizomatous perennial herbs; mainly Mediterranean arealiliopsid genus, monocot genus - genus of flowering plants having a single cotyledon (embryonic leaf) in the seed Arisarum vulgare, friar's-cowl - tuberous perennial having a cowl-shaped maroon or violet-black spathe; Mediterranean; Canaries; Azores |