1alpha,25-dihydroxycholecalciferol

1α,25-di·hy·drox·y·cho·le·cal·cif·er·ol

(dī'hī-drok'sē-kō'lē-kal-sif'ĕr-ol), An active form of vitamin D formed in the proximal convoluted tubules of the kidney. A deficiency of the receptor for 1α,25-dihydroxycholecalciferol produces all features of vitamin D3 deficiency.