<p><strong>Verb (used with or without object):</strong></p><ul><li>to change from a fluid into a thickened mass; curdle; congeal: Let the pudding stand two hours until it coagulates.</li><li>Synonyms: thicken, solidify, set, clot.</li><li>(of blood) to form a clot.</li><li>(of colloidal particles) to flocculate or cause to flocculate by adding an electrolyte to an electrostatic colloid.</li></ul><p><strong>Adjective:</strong></p><ul><li>Obsolete: coagulated.</li></ul>