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Definition of COLLOID
: a gelatinous or mucinous substance found normally in the thyroid and also in diseased tissue
a: a substance that consists of particles dispersed throughout another substance which are too small for resolution with an ordinary light microscope but are incapable of passing through a semipermeable membrane
b: a mixture consisting of a colloid together with the medium in which it is dispersed <smoke is a colloid>
: a gelatinous or mucinous substance found in tissues in disease or normally (as in the thyroid)
a: a substance consisting of particles that are dispersed throughout another substance and are too small for resolution with an ordinary light microscope but are incapable of passing through a semipermeable membrane b: a mixture (as smoke) consisting of a colloid together with the medium in which it is dispersed
Substance consisting of particles that, although too tiny to be seen with the unaided eye (typically 1 nanometre to 10 micrometres), are substantially larger than atoms and ordinary molecules and that are dispersed in a continuous phase. Both the dispersed phase and the continuous phase may be solid, liquid, or gas; examples include suspensions, aerosols, smokes, emulsions, gels, sols, pastes, and foams. Colloids are often classified as reversible or irreversible, depending on whether their components can be separated. Dyes, detergents, polymers, proteins, and many other important substances exhibit colloidal behaviour.