25-hydroxycholecalciferol

noun
25-hy·droxy·cho·le·cal·cif·er·ol | \ ˈtwent-ē-ˈfīv-hī-ˌdräk-sē-ˌkō-lə-(ˌ)kal-ˈsif-ə-ˌrȯl, -ˌrōl \

Medical Definition of 25-hydroxycholecalciferol 

: a sterol C27H44O2 that is a metabolite of cholecalciferol formed in the liver, is the circulating form of vitamin D, and has some activity in maintaining calcium homeostasis and preventing rickets

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