Definition of "vitamin" in English

noun

1. 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.

   • a food rich in vitamins

2. (informal, figurative) preceding a word or its initial letter, to imply that the referent benefits health or wellness

   • Vitamin N: The Essential Guide to a Nature-Rich Life
   • I just follow three three Cs: clean living, chewing thoroughly, and a daily dose of vitamin Church

verb

1. (transitive, dated) To fortify with vitamins.