naphthoquinone naphtholsulphonic • naphthoresorcinol · · · Info · Definitions · Synonyms · Characters · · naphthoquinone · · Text Latin · · Script 14 · · Length 5 · · Syllables Definitions · · · (noun) a fat-soluble vitamin that helps in the clotting of blood. Synonyms: vitamin K, antihemorrhagic factor. · · Noun Definition 1 Synonyms · · · vitamin k · · Synonym 1 antihemorrhagic factor · · Synonym 2 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 q latin small letter q U+0071 t latin small letter t U+0074 u latin small letter u U+0075