matrix calculus(redirected from Matrix derivative)
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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.