melissa

noun
me·​lis·​sa | \mə-ˈlis-ə \

Medical Definition of melissa 

1 capitalized : a genus of Old World mints having clusters of small white or yellowish flowers and including the lemon balm (M. officinalis)

2 : the leaves and tops of the lemon balm that are a source of citral and have been used as a diaphoretic in the form of a tea

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