calcitriol

Definition of calcitriol

calcitriol

(KAL-sih-TRY-ol)
The active form of vitamin D. Calcitriol is formed in the kidneys or made in the laboratory. It is used as a drug to increase calcium levels in the body in order to treat skeletal and tissue-related calcium deficiencies caused by kidney or thyroid disorders.

Source: NCI Dictionary of Cancer Terms