matrix calculus

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ma·trix cal·cu·lus

a yellowish-white to light tan urinary calculus containing calcium salts, with the consistency of putty; composed chiefly of an organic matrix consisting of a mucoprotein and a sulfated mucopolysaccharide, and usually associated with chronic infection.

ma·trix cal·cu·lus

(mā'triks kal'kyū-lŭs)
A yellowish-white to whitish-tan urinary calculus containing calcium salts in an organic matrix and usually associated with chronic infection.
References in periodicals archive ?
Formulation of enamel matrix derivative for surface coating.
Periodontal regeneration with enamel matrix derivative in one human
Stina Gestrelius also presented another four Biora BioEx projects to persue the development of enamel matrix derivatives outside the oral cavity.