Dictionary definitions
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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]
