1α,25-Dihydroxycholecalciferol (thus, a 1,3,25-triol); formation of c. is the second step in the biological conversion of vitamin D3 to its active form; it is more potent than calcidiol.
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cal·ci·tri·ol .kal-sə-'trī-.ȯl, -.ōl n a physiologically active metabolic derivative C27H44O3 of cholecalciferol that is synthesized in the liver and kidney and stimulates the intestinal absorption of calcium called also 1,25-dihydroxycholecalciferol
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cal·ci·tri·ol (kal″sĭ-triґol) 1. 1,25-dihydroxycholecalciferol. 2. a preparation of this compound, used in the treatment of hypocalcemia, hypophosphatemia, rickets, and osteodystrophy associated with a variety of disorders, such as chronic renal failure and hypoparathyroidism. Administered orally or intravenously.Medical dictionary. 2011.