<p><strong>Noun</strong></p><ul><li>a method of calculation, especially one of several highly systematic methods of treating problems by a special system of algebraic notations, as differential or integral calculus.</li><li>a stone, or concretion, formed in the gallbladder, kidneys, or other parts of the body. Also called tartar.</li><li>a hard, yellowish to brownish-black deposit on teeth formed largely through the mineralization of dead bacteria in dental plaques by the calcium salts in salivary secretions and subgingival transudates.</li><li>calculation; estimation or computation: the calculus of political appeal.</li></ul><p><strong>Synonyms</strong></p><ul><li>assortment</li><li>assemblage</li><li>collection</li></ul>