RhymeZone: calcitriol definitions

Definitions of calcitriol:

noun: (biochemistry, pharmacology) A physiologically active metabolic derivative C₂₇H₄₄O₃ of cholecalciferol (1,25-dihydroxycholecalciferol) that is synthesized in the liver and kidney and stimulates the intestinal absorption of calcium.

(Definitions from Wiktionary)