Function: noun
Etymology: from the initial letter of Danish & Swedish koagulation coagulation, Norwegian koagulasjon & German Koagulation
Date: circa 1935
1 : either of two naturally occurring fat-soluble vitamins C 31 H 46 O 2 and C 41 H 56 O 2 essential for the clotting of blood because of their role in the production of prothrombin ― called also respectively vitamin K 1 vitamin K 2
2 : any of several synthetic compounds closely related chemically to natural vitamins K 1 and K 2 and of similar biological activity