melissa : Idioms & Phrases
genus melissa
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noun a genus of Old World mints of the family Labiatae
Melissa.
WordNet
melissa officinalis
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noun 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
sweet balm; lemon balm; bee balm; garden balm; beebalm.