noun /ˈvɪt.ə.mɪn,ˈvaɪtamɪn,ˈvaɪ.tə.mən/
Any of a specific group of organic compounds essential in small quantities for healthy human growth, metabolism, development, and body function; found in minute amounts in plant and animal foods or sometimes produced synthetically; deficiencies of specific vitamins produce specific disorders.
Wikipedia foundation.