oca

from WordNet (r) 3.0 (2006)

oca
    n 1: South American wood sorrel cultivated for its edible tubers
         [syn: {oca}, {oka}, {Oxalis tuberosa}, {Oxalis crenata}]

from The Collaborative International Dictionary of English v.0.48

Oca \O"ca\, n. [Sp.] (Bot.)
   A Peruvian name for certain species of {Oxalis} ({Oxalis
   crenata}, and {Oxalis tuberosa}) which bear edible tubers.
   [1913 Webster]