'vitamin K' definitions:

Definition of 'vitamin K'

From: WordNet
noun
A fat-soluble vitamin that helps in the clotting of blood [syn: vitamin K, naphthoquinone, antihemorrhagic factor]

Definition of 'vitamin K'

From: GCIDE
  • vitamin K \vitamin K\ n. (1929) [from G. Koagulationsvitamin.] either of two fat-soluble vitamins (vitamin K1 or vitamin K2) that help clot blood by participating in the fromation of prothrombin.
  • Syn: naphthoquinone. [WordNet 1.5 +PJC]