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Answer for the clue "A fat-soluble vitamin that helps in the clotting of blood ", 14 letters:
naphthoquinone

Word definitions for naphthoquinone in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context organic compound English) Either of two isomers of polycyclic aromatic ketones derived from naphthalene.

WordNet Word definitions in WordNet
n. a fat-soluble vitamin that helps in the clotting of blood [syn: vitamin K , antihemorrhagic factor ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Naphthoquinone \Naph`tho*qui"none\, n. [Naphthalene + quinone.] (Chem.) A yellow crystalline substance, C10H6O2 , analogous to quinone, obtained by oxidizing naphthalene with chromic acid.

Wikipedia Word definitions in Wikipedia
Naphthoquinone is a class of organic compounds derived from naphthalene . Three isomers are normally discussed: 1,2-Naphthoquinone 1,4-Naphthoquinone , of which the Vitamin K group compounds are derivatives 2,6-Naphthoquinone ( amphi -naphthoquinone) Naphthoquinones ...