The Collaborative International Dictionary of English v.0.48:

Absinth \Ab"sinth`\, Absinthe \Ab"sinthe`\ ([a^]b"s[i^]nth`), n.
   [F. absinthe. See Absinthium.]
   1. The plant absinthium or common wormwood.
      [1913 Webster]

   2. A strong spirituous liqueur made from wormwood and brandy
      or alcohol.
      [1913 Webster]

            Absinthe makes the tart grow fonder.  --Ernest
                                                  Dowson
      [PJC]

   Note: An article on absinthe was prepared by Matthew Baggott
         (bagg@ellis.uchicago.edu) for distribution on the
         newsgroup alt.drugs.
         [PJC]

WordNet (r) 3.0 (2006):

absinthe
    n 1: aromatic herb of temperate Eurasia and North Africa having
         a bitter taste used in making the liqueur absinthe [syn:
         common wormwood, absinthe, old man, lad's love,
         Artemisia absinthium]
    2: strong green liqueur flavored with wormwood and anise [syn:
       absinth, absinthe]