lemon balm
     n 1: bushy perennial Old World mint having small white or
          yellowish flowers and fragrant lemon-flavored leaves; a
          garden escapee in northern Europe and North America
          [syn: {garden balm}, {sweet balm}, {bee balm}, {beebalm},
           {Melissa officinalis}]
     2: lemony leaves used for a tisane or in soups or fruit punches
Source: WordNet® 2.0