unsaturated


From The Collaborative International Dictionary of English v.0.48:

Unsaturated \Un*sat"u*ra`ted\, a.
   1. Capable of absorbing or dissolving to a greater degree;
      as, an unsaturated solution.
      [1913 Webster]

   2. (Chem.) Capable of taking up, or of uniting with, certain
      other elements or compounds, without the elimination of
      any side product; thus, aldehyde, ethylene, and ammonia
      are unsaturated; benzene has three unsaturated bonds. The
      term is applied most commonly to compounds with a double
      or triple bond between two carbon atoms (as in ethylene).
      [1913 Webster +PJC]
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