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Definition of Coloid

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

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.

- Webster's Unabridged Dictionary (1913)

  • (chemistry) a stable system of two phases, one of which is dispersed in the other in the form of very small droplets or particles
- The Nuttall Encyclopedia

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