Source : Webster's Revised Unabridged Dictionary (1913)

Melissa \Me*lis"sa\, n. [NL., fr. Gr. me`lissa a bee, honey.]
   (Bot.)
   A genus of labiate herbs, including the balm, or bee balm
   ({Melissa officinalis}).

Source : WordNet®

Melissa
     n : a genus of Old World mints of the family Labiatae [syn: {genus
         Melissa}]