naphthoquinone

from WordNet (r) 3.0 (2006)

naphthoquinone
    n 1: a fat-soluble vitamin that helps in the clotting of blood
         [syn: {vitamin K}, {naphthoquinone}, {antihemorrhagic
         factor}]

from The Collaborative International Dictionary of English v.0.48

Naphthoquinone \Naph`tho*qui"none\, n. [Naphthalene + quinone.]
   (Chem.)
   A yellow crystalline substance, {C10H6O2}, analogous to
   quinone, obtained by oxidizing naphthalene with chromic acid.
   [1913 Webster]