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tachysterol

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