The Collaborative International Dictionary of English v.0.48:

Liquor \Liq"uor\ (l[i^]k"[~e]r), n. [OE. licour, licur, OF.
   licur, F. liqueur, fr. L. liquor, fr. liquere to be liquid.
   See Liquid, and cf. Liqueur.]
   1. Any liquid substance, as water, milk, blood, sap, juice,
      or the like.
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   2. Specifically, alcoholic or spirituous fluid, either
      distilled or fermented, as brandy, wine, whisky, beer,
      etc.
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   3. (Pharm.) A solution of a medicinal substance in water; --
      distinguished from tincture and aqua.
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   Note: The U. S. Pharmacopoeia includes, in this class of
         preparations, all aqueous solutions without sugar, in
         which the substance acted on is wholly soluble in
         water, excluding those in which the dissolved matter is
         gaseous or very volatile, as in the aqu[ae] or waters.
         --U. S. Disp.
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   Labarraque's liquor (Old Chem.), a solution of an alkaline
      hypochlorite, as sodium hypochlorite, used in bleaching
      and as a disinfectant.

   Liquor of flints, or Liquor silicum (Old Chem.), soluble
      glass; -- so called because formerly made from powdered
      flints. See Soluble glass, under Glass.

   Liquor of Libavius. (Old Chem.) See Fuming liquor of
      Libavius, under Fuming.

   Liquor sanguinis (s[a^]n"gw[i^]n*[i^]s), (Physiol.), the
      blood plasma.

   Liquor thief, a tube for taking samples of liquor from a
      cask through the bung hole.

   To be in liquor, to be intoxicated.
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