n 1  cap  :  a genus of Old World mints having axillary clusters of small white or yellowish flowers and including the lemon balm (M. officinalis)  2  :  the leaves and tops of the lemon balm (Melissa officinalis) that are a source of citral and have been used as a diaphoretic in the form of a tea .
 
 
 
Similar sounding terms:  mal·aise  mal·le·us 
 
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