Biochemistry. a vitamin D compound, C27H44O3, occurring in humans as a hormone derived from cholesterol, that acts in the regulation and absorption of calcium.
Pharmacology. a preparation of this compound, used in the treatment of osteoporosis and bone fracture.
Origin of calcitriol
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019