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.