<p><strong>Noun</strong></p><ul><li>a substance made up of a system of particles with linear dimensions in the range of about 10 −7 to 5 × 10 −5 centimeters dispersed in a continuous gaseous, liquid, or solid medium whose properties depend on the large specific surface area.</li><li>the particles can be large molecules like proteins, or solid, liquid, or gaseous aggregates and they remain dispersed indefinitely.</li><li>a colloidal substance in the body, as a stored secretion or a cyst.</li></ul><p><strong>Adjective</strong></p><ul><li>colloidal.</li></ul>