/ Dictionary / Index C calcitriol: Meaning and Definition of Find definitions for: cal•cit•ri•ol Pronunciation: (kal-si'trē-ôl", -ol"), [key] — n. a vitamin D compound, CHO, occurring in humans as a hormone derived from cholesterol, that acts in the regulation and absorption of calcium. 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. calcitonin calcium Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language