[1] : The Collaborative International Dictionary of English v.0.48

mint \mint\ mi^nt, n. as. minte, fr. l. mentha, gr. mi`nqa,
   mi`nqh. bot.
   the name of several aromatic labiate plants, mostly of the
   genus mentha, yielding odoriferous essential oils by
   distillation. see mentha.
   1913 webster

   note:

   corn mint is mentha arvensis.

   horsemint is mentha sylvestris, and in the united states
      monarda punctata, which differs from the true mints in
      several respects.

   mountain mint is any species of the related genus
      pycnanthemum, common in north america.

   peppermint is mentha piperita.

   spearmint is mentha viridis.

   water mint is mentha aquatica.
      1913 webster

   mint camphor. chem. see menthol.

   mint julep. see julep.

   mint sauce, a sauce flavored with spearmint, for meats.
      1913 webster
see also:
mentha corn mint mentha arvensis horsemint mentha sylvestris monarda punctata 
mountain mint pycnanthemum peppermint mentha piperita spearmint 
mentha viridis water mint mentha aquatica mint camphor menthol 
mint julep julep mint sauce 

[2] : The Collaborative International Dictionary of English v.0.48

water mint \wa"ter mint`\
   a kind of mint mentha aquatica growing in wet places, and
   sometimes having a perfume resembling bergamot.
   1913 webster
see also:
mentha aquatica 

[3] : WordNet (r) 2.0

water mint
     n : a european mint that thrives in wet places; has a perfume
         like that of the bergamot orange; naturalized in eastern
         north america syn: water-mint, mentha aquatica
see also:
water-mint mentha aquatica 

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