calculus (kal'cu-lus)

PI. calculi. An aggregation (generally pathological) of matter forming a concretion, more or le resembling a pebble or a particle of gravel, in a canal or a hollow organ of the body. The varieties commonly met with are: urinary and biliary calculi, stones formed in the kidney, ureters, or urinary bladder or in the bile ducts or gall-bladder. Other varieties are: arthritic; bronchial; dental; hepatic; intestinal (see enterolith); mammary; nasal (see rhinolith); ovarian; pancreatic; prostatic; salivary; spermatic; stomachic; uterine. Differences in form are indicated by the terms coral c.; as in the calculus which is fitted into the calices of the kidney; hemp seed c, and mulberry c. Differences in composition are indicated by the terms blood c; fusible c; oxalate of lime c; serumal c; stercoraceous c; struvit c; sub morpho us c.; xanthic c. salivary c. i. A c. formed in the substance or the duct of a salivary gland. 2. The calcareous deposit ("tartar") forming an incrustation on the teeth. [Lat., calculus, a small stone.]