/ Dictionary / Index D dihydrotachysterol: Meaning and Definition of Find definitions for: di•hy•dro•ta•chys•ter•ol Pronunciation: (dī-hī"drō-tu-kis'tu-rôl", -rol"), [key] — n. Pharm. a white, crystalline, water-insoluble sterol, CHO, derived from ergosterol: used chiefly in the treatment of hypoparathyroidism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dihydrostreptomycin dihydroxy Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language