lemon balm le·mon·balm uncommon noun 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 Synonymslemon balmgarden balmsweet balmbee balmbeebalmMelissa officinalis 2. lemony leaves used for a tisane or in soups or fruit punches Synonymslemon balm Related words Broader terms herb Parts lemon balmMelissa Part of lemon balm WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.