The Collaborative International Dictionary
Water arum
Water arum \Wa"ter a"rum\ (Bot.) An aroid herb ( Calla palustris) having a white spathe. It is an inhabitant of the north temperate zone.
WordNet
water arum
n. plant of wetlands and bogs of temperate regions having small greenish flowers partly enclosed in a white spathe and red berries [syn: wild calla, Calla palustris]