1. (noun)lemon balm, garden balm, sweet balm, bee balm, beebalm, Melissa officinalis 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 Synonyms: bergamotmint, lemonbalm, beebalm, gardenbalm, bee balm, sweetbalm, oswego tea