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

lemon \lem"on\ le^m"u^n, n. f. limon, per. limacm=un;
   cf. ar. laim=un, sp. limon, it. limone. cf. lime a
   fruit.
   1913 webster
   1. bot. an oval or roundish fruit resembling the orange,
      and containing a pulp usually intensely acid. it is
      produced by a tropical tree of the genus citrus, the
      common fruit known in commerce being that of the species
      citrus limonum or citrus medica var. limonum. there
      are many varieties of the fruit, some of which are sweet.
      1913 webster

   2. the tree which bears lemons; the lemon tree.
      1913 webster

   lemon grass bot., a fragrant east indian grass
      andropogon shoenanthus, and perhaps other allied
      species, which yields the grass oil used in perfumery.

   lemon sole zool., a yellow european sole solea
      aurantiaca.

   salts of lemon chem., a white crystalline substance,
      inappropriately named, as it consists of an acid potassium
      oxalate and contains no citric acid, which is the
      characteristic acid of lemon; -- called also salts of
      sorrel. it is used in removing ink stains. see oxalic
      acid, under oxalic. colloq.
      1913 webster
see also:
lime citrus citrus limonum citrus medica lemon grass andropogon shoenanthus 
lemon sole solea aurantiaca salts of lemon salts of sorrel oxalic acid 
oxalic 

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