vitamin K

n.

1.

either of two fat-soluble vitamins (vitamin K1 or vitamin K2) that help clot blood by participating in the fromation of prothrombin.

Noun

1.

vitamin K - a fat-soluble vitamin that helps in the clotting of blood Synonyms: antihemorrhagic factor, naphthoquinone

antihemorrhagic factor, fat-soluble vitamin, menadione, naphthoquinone, phylloquinone, phytonadione, vitamin K1, vitamin K3