dihydrotachysterol
[ dahy-hahy-droh-tuh-kis-tuh-rawl, -rol ]
/ daɪˌhaɪ droʊ təˈkɪs təˌrɔl, -ˌrɒl /
noun Pharmacology.
a white, crystalline, water-insoluble sterol, C28H46O, derived from ergosterol: used chiefly in the treatment of hypoparathyroidism.