WordNet (r) 3.0 (2006):

field balm
    n 1: trailing European aromatic plant of the mint family having
         rounded leaves and small purplish flowers often grown in
         hanging baskets; naturalized in North America; sometimes
         placed in genus Nepeta [syn: ground ivy, alehoof,
         field balm, gill-over-the-ground, runaway robin,
         Glechoma hederaceae, Nepeta hederaceae]
    2: low-growing strongly aromatic perennial herb of southern
       Europe to Great Britain; naturalized in United States [syn:
       lesser calamint, field balm, Calamintha nepeta,
       Calamintha nepeta glantulosa, Satureja nepeta, Satureja
       calamintha glandulosa]