7-dehydrocholesterol
noun
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