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The Collaborative International Dictionary
Yamp

Yamp \Yamp\, n. (Bot.) An umbelliferous plant ( Carum Gairdneri); also, its small fleshy roots, which are eaten by the Indians from Idaho to California.

Wiktionary
yamp

n. An umbelliferous plant, ''Perideridia gairdneri'', native to California, whose tubers were used as food by Native Americans.