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7-dehydrocholesterol

noun 7-de·hy·dro·cho·les·ter·ol \ ˈsev-ən-(ˌ)dē-ˌhī-drō-kə-ˈles-tə-ˌrōl , -ˌrȯl \
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medical Definition of 7-dehydrocholesterol

: a crystalline steroid alcohol C27H43OH that occurs (as in the skin) chiefly in higher animals and humans and that yields vitamin D3 on irradiation with ultraviolet light

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