The Collaborative International Dictionary of English v.0.48:

Supersaturate \Su`per*sat"u*rate\, v. t.
   To add to beyond saturation; as, to supersaturate a solution.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "supersaturate":
   allay, choke, cloy, congest, cram, crowd, drench, engorge, fill,
   fill up, glut, gluttonize, gorge, jade, jam, jam-pack, overburden,
   overcharge, overdose, overfeed, overfill, overgorge, overlade,
   overload, oversaturate, overstuff, overweight, pack, pall, sate,
   satiate, satisfy, saturate, slake, soak, stuff, supercharge,
   surcharge, surfeit