wild rice

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A tall aquatic annual grass (Zizania aquatica) of North America, bearing edible grain.
2. n. The grain of this plant.

Wiktionary

1. n. Any one of the four species of grasses which form the genus Zizania, which have edible grains and edible stems.
2. n. The edible grain (the edible rice) which is harvested from these grasses.

GNU Webster's 1913

1. adj. (Bot.) See Indian rice, under Rice.

WordNet 3.0

1. n. perennial aquatic grass of North America bearing grain used for food
2. n. grains of aquatic grass of North America