vitamin K1 | n. one of the two K vitamins, (C31H46O2). It is fat-soluble and occurs naturally as the trans isomer. Chemically it is 2-methyl-3-phytyl-1, 4, -naphthoquinone. Syn. -- phylloquinone, phytonadione, antihemorrhagic vitamin.. [ WordNet 1.5 +PJC ] |
vitamin K3 | n. 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 [ MI11 ] Syn. -- vitaminK2(0); menaphthone. [ WordNet 1.5 ] |