breadroot

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various perennial herbs of the genus Pediomelum in the pea family, especially P. esculentum (syn. Psoralea esculenta) of central North America, having a tuberous, starchy root that was an important food for many Native Americans.

from The Century Dictionary.

• noun A plant of the genus Psoralea, the P. esculenta. See Psoralea.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) The root of a leguminous plant (Psoralea esculenta), found near the Rocky Mountains. It is usually oval in form, and abounds in farinaceous matter, affording sweet and palatable food.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The edible root of a leguminous plant (Psoralea esculenta).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun densely hairy perennial of central North America having edible tuberous roots