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2. a stone, or concretion, formed in the gallbladder, kidney, or other part of the body. 3. a hard, yellowish to brownish black deposit on teeth formed largely through the calcification of dental plaque; tartar. 4. calculation: the calculus of political appeal.
renal tubule. The part of a nephron through which renal filtrate from the renal corpuscle flows and is changed to urine by reabsorption and secretion. The parts, in order, are the proximal convoluted tubule, the loop of Henle, the distal convoluted tubule, and collecting tubule.See also: tubule.enle's t's the straight ascending and descending portions of a renal tubule forming Henle's loop. lactiferous t's galactophorous tubules. mesonephric t's the tubules comprising the mesonephros, or temporary kidney, of amniotes. metanephric t's the tubules comprising the permanent kidney of amniotes.