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.
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.