araceous /a-rāˈshəs/ or aroid /āˈroid/ adjective

1. Of the Araceae
2. Like an arum

āˈroid noun

Any plant of the family

arum lily noun

A plant with large leaves, a fleshy stem and a large ornamental white spathe with yellow spadix (also called calla lily, zantedeschia)

Titan arum

See under Titan.