Source : Webster's Revised Unabridged Dictionary (1913)

Colloid \Col"loid\, a. [Gr. ko`lla glue + -oid. Cf.
   {Collodion}.]
   Resembling glue or jelly; characterized by a jellylike
   appearance; gelatinous; as, colloid tumors.

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.

   2. (Med.) A gelatinous substance found in colloid
      degeneration and colloid cancer.

   {Styptic colloid} (Med.), a preparation of astringent and
      antiseptic substances with some colloid material, as
      collodion, for ready use.

Source : WordNet®

colloid
     n : a mixture with properties between those of a solution and
         fine suspension