Definition of "vitamin k3" []

• Menadione, (C11H8O2) being chemically 2-methyl-1,4,-naphthoquinone. Having no side chain in the 3 position, it cannot exert all functions of a true K vitamin and the designation as vitamin K3 has been discouraged. (noun)

Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)