calabazilla

from The Century Dictionary.

• noun In southern California, the Cucurbita perennis, a native species of squash, with an exceedingly large root. The pulp of the green fruit is used as a substitute for soap, and the macerated root as a medicinal remedy.

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

• noun perennial vine of dry parts of central and southwestern United States and Mexico having small hard mottled green inedible fruit