1. A twining perennial herb (Ullucus tuberosus) native to the Andes bearing fleshy tubers.
2. The edible fleshy tuber of this plant.

[American Spanish, from Quechua ullucu.]

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.