tachysterol

noun

ta·chys·ter·ol | \ta-ˈkist-ə-ˌrȯl,

\

Medical Definition of tachysterol

: an oily liquid alcohol C₂₈H₄₃OH isomeric with ergosterol that is formed by ultraviolet irradiation of ergosterol or lumisterol and that on further irradiation yields vitamin D₂ — see dihydrotachysterol

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