colloid col·loid (kŏl'oid')
A suspension of finely divided particles in a continuous medium from which the particles do not settle out rapidly and are not readily filtered.
The particulate matter so suspended.
The gelatinous stored secretion of the thyroid gland, consisting mainly of thyroglobulin.
Gelatinous material resulting from colloid degeneration in diseased tissue. Also called colloidin.
A mixture in which very small particles of one substance are distributed evenly throughout another substance. The particles are generally larger than those in a solution, and smaller than those in a suspension. Paints, milk, and fog are colloids. Compare solution, suspension.
A substance made up of particles that are larger than most molecules; these particles do not actually dissolve in substances but stay suspended in them.
Note: Fog, paints, and foam rubber are colloids.