ETYM Latin arum, aros.
1. Any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe; SYN. aroid.
2. Sagolike starch obtained from cuckoopint root.
Large-spathed plant, called “cuckoo-pint” or “lords and ladies”. arum lily, calla lily.
Any plant of the family Araceae, especially the Old World genus Arum. The arum called the trumpet lily Zantedeschia aethiopica, an ornamental plant, is a native of South Africa.
Jack-in-the-pulpit and skunk cabbage are North American arums belonging to related genera.