​BALM, a fragrant herb, Melissa officinalis, of the Deadnettle order (Labiatae) with opposite, ovate, crenulated leaves, which are wrinkled above, and small white or rose-spotted flowers. It is a native of central and southern Europe; it is often grown in gardens and has become naturalized in the south of England and grows apparently wild as a garden escape in North America. The name is from the Greek μέλισσα, the plant being visited by bees. Bastard Balm is an allied plant, Melittis Melissophyllum, a southern European species, found in the south and south-west of England.