The Collaborative International Dictionary of English v.0.48:

Perilla \Pe*ril"la\, prop. n. [Etymol. uncertain.] (Bot.)
   A genus of labiate herbs, of which one species (Perilla
   ocimoides, or Perilla Nankinensis) is often cultivated for
   its purple or variegated foliage.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Perilla
    n 1: small genus of Asiatic herbs [syn: Perilla, genus
         Perilla]