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matrix calculus

n.
  1. A urinary calculus containing calcium salts and consisting primarily of an organic matrix composed of a mucoprotein and a sulfated mucopolysaccharide; it is usually associated with chronic infection.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.