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