The Collaborative International Dictionary of English v.0.48:

Saturant \Sat"u*rant\, a. [L. saturans, p. pr. See Saturate.]
   Impregnating to the full; saturating.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Saturant \Sat"u*rant\, n.
   1. (Chem.) A substance used to neutralize or saturate the
      affinity of another substance.
      [1913 Webster]

   2. (Med.) An antacid, as magnesia, used to correct acidity of
      the stomach.
      [1913 Webster]