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

menthol \men"thol\, n. mentha + -ol. chem.
   a white, crystalline, aromatic substance c10h20o
   resembling camphor, extracted from oil of peppermint
   mentha; -- called also mint camphor or peppermint
   camphor. it has the peculiar effect on skin and membranes of
   making them feel cool, and is used in liqueurs, confections,
   cigarettes, cough drops and perfumes, among other things.
   1913 webster +pjc
see also:
c10h20o mentha mint camphor peppermint camphor 

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

camphor \cam"phor\ ka^m"f~er, n. oe. camfere, f. camphre
   cf. it. canfora, sp. camfora, alcanfor, ll. canfora,
   camphora, ngr. kafoyra`, fr. ar. k=af=ur, prob. fr. skr.
   karp=ura.
   1. a tough, white, aromatic resin, or gum, obtained from
      different species of the laurus family, esp. from
      cinnamomum camphara the laurus camphora of
      linnaeus.. camphor, c10h16o, is volatile and
      fragrant, and is used in medicine as a diaphoretic, a
      stimulant, or sedative.
      1913 webster

   2. originally, a gum resembling ordinary camphor, obtained
      from a tree dryobalanops aromatica formerly
      dryobalanops camphora growing in sumatra and borneo;
      now applied to its main constituent, a terpene alcohol
      obtainable as a white solid c10h18o, called also borneo
      camphor, malay camphor, malayan camphor, camphor of
      borneo, sumatra camphor, bornyl alcohol, camphol,
      and borneol. the isomer from dryobalanops is
      dextrorotatory; the levoratatory form is obtainable from
      other species of plants, and the racemic mixture may be
      obtained by reduction of camphor. it is used in perfumery,
      and for manufacture of its esters. see borneol.
      1913 webster +pjc

   note: the name camphor is also applied to a number of bodies
         of similar appearance and properties, as cedar
         camphor, obtained from the red or pencil cedar
         juniperus virginiana, and peppermint camphor, or
         menthol, obtained from the oil of peppermint.
         1913 webster

   camphor oil chem., name variously given to certain
      oil-like products, obtained especially from the camphor
      tree.

   camphor tree, a large evergreen tree cinnamomum
      camphora with lax, smooth branches and shining
      triple-nerved lanceolate leaves, probably native in china,
      but now cultivated in most warm countries. camphor is
      collected by a process of steaming the chips of the wood
      and subliming the product.
      1913 webster
see also:
laurus cinnamomum camphara laurus camphora c10h16o dryobalanops aromatica dryobalanops camphora 
c10h18o borneo camphor malay camphor malayan camphor camphor of borneo 
sumatra camphor bornyl alcohol camphol borneol dryobalanops 
borneol cedar camphor juniperus virginiana peppermint camphor menthol 
camphor oil camphor tree cinnamomum camphora 

[3] : WordNet (r) 2.0

menthol
     n : a lotion containing menthol which gives it a mint flavoring

Menthol >> M Words
Menthol, definition of term: Menthol
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