Pronunciation: (kal-si'trē-ôl", -ol"), [key]
1. Biochem.a vitamin D compound, C27H44O3, occurring in humans as a hormone derived from cholesterol, that acts in the regulation and absorption of calcium.
2. Pharm.a preparation of this compound, used in the treatment of osteoporosis and bone fracture.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.