The Collaborative International Dictionary of English v.0.48:

Colloid \Col"loid\, n.
   1. (Physiol. Chem.) A substance (as albumin, gum, gelatin,
      etc.) which is of a gelatinous rather than a crystalline
      nature, and which diffuses itself through animal membranes
      or vegetable parchment more slowly than crystalloids do;
      -- opposed to crystalloid.
      [1913 Webster]

   2. (Med.) A gelatinous substance found in colloid
      degeneration and colloid cancer.
      [1913 Webster]

   Styptic colloid (Med.), a preparation of astringent and
      antiseptic substances with some colloid material, as
      collodion, for ready use.
      [1913 Webster]