Source : Webster's Revised Unabridged Dictionary (1913)

Eruca \E*ru"ca\, n.; pl. {Eruc[ae]}. [L., a caterpillar, also, a
   sort of colewort.] (Zo["o]l.)
   An insect in the larval state; a caterpillar; a larva.

Source : WordNet®

Eruca
     n : annual to perennial herbs of the Mediterranean region [syn:
         {genus Eruca}]