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2 definitions found
 for lemon oil
From The Collaborative International Dictionary of English v.0.48 :

  Essential \Es*sen"tial\ ([e^]s*s[e^]n"sjal), a. [Cf. F.
     essentiel. See Essence.]
     1. Belonging to the essence, or that which makes an object,
        or class of objects, what it is.
        [1913 Webster]
  
              Majestic as the voice sometimes became, there was
              forever in it an essential character of
              plaintiveness.                        --Hawthorne.
        [1913 Webster]
  
     2. Hence, really existing; existent.
        [1913 Webster]
  
              Is it true, that thou art but a name,
              And no essential thing?               --Webster
                                                    (1623).
        [1913 Webster]
  
     3. Important in the highest degree; indispensable to the
        attainment of an object; indispensably necessary.
        [1913 Webster]
  
              Judgment's more essential to a general
              Than courage.                         --Denham.
        [1913 Webster]
  
              How to live? -- that is the essential question for
              us.                                   --H. Spencer.
        [1913 Webster]
  
     4. Containing the essence or characteristic portion of a
        substance, as of a plant; highly rectified; pure; hence,
        unmixed; as, an essential oil. "Mine own essential
        horror." --Ford.
        [1913 Webster]
  
     5. (Mus.) Necessary; indispensable; -- said of those tones
        which constitute a chord, in distinction from ornamental
        or passing tones.
        [1913 Webster]
  
     6. (Med.) Idiopathic; independent of other diseases.
        [1913 Webster]
  
     Essential character (Biol.), the prominent characteristics
        which serve to distinguish one genus, species, etc., from
        another.
  
     Essential disease, Essential fever (Med.), one that is
        not dependent on another.
  
     Essential oils (Chem.), a class of volatile oils, extracted
        from plants, fruits, or flowers, having each its
        characteristic odor, and hot burning taste. They are used
        in essences, perfumery, etc., and include many varieties
        of compounds; as lemon oil is a terpene, oil of bitter
        almonds an aldehyde, oil of wintergreen an ethereal
        salt, etc.; -- called also volatile oils in distinction
        from the fixed or nonvolatile.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  lemon oil
      n 1: fragrant yellow oil obtained from the lemon peel

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