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Definition of Calcitriol
1. Noun. (biochemistry) The active metabolite ''1,25-dihydroxycholecalciferol'' of vitamin D3 that is involved in the absorption of calcium ¹
¹ Source: wiktionary.com
Medical Definition of Calcitriol
1. 1_, 25 dihydroxyvitamin D3. The form of vitamin D3 that is biologically active in intestinal transport and calcium resorption by bone. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)