Source : Webster's Revised Unabridged Dictionary (1913)

Oxalis \Ox"a*lis\, n. [L., a kind of sorrel, Gr. ???, fr. ????
   sharp, pungent, acid.] (Bot.)
   A genus of plants, mostly herbs, with acid-tasting
   trifoliolate or multifoliolate leaves; -- called also {wood
   sorrel}.

Source : WordNet®

oxalis
     n : any plant or flower of the genus Oxalis [syn: {sorrel}, {wood
         sorrel}]