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ta·chys·ter·ol | \ ta-ˈkist-ə-ˌrȯl 
, -ˌrōl \
, -ˌrōl \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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