tachysterol
noun
ta·chys·ter·ol
ta-ˈkist-ə-ˌrȯl
-ˌrōl
: 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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Merriam-Webster unabridged
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