phytonadione

P3H4Y4T1O1N1A1D2I1O1N1E1
US/ˌfaɪ.toʊ.nəˈdaɪˌoʊn/

A form of phytomenadione — A yellow oily naphthoquinone C₃₁H₄₆O₂ that is obtained especially from alfalfa, cabbage, spinach, and other leafy green vegetables or made synthetically and that has a fast, potent, and prolonged biological effect. It is essential for the blood-clotting process, effective orally, and useful especially in treating hypoprothrombinemia induced by anticoagulant drugs (trademark Mephyton).

Similar
vitamin K1phylloquinone
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Meanings

nounphytonadione (uncountable)
  1. alternativeuncountablebiochemistryAlternative form of phytomenadione.

Synonyms & antonyms

nouna form of vitamin K, based on 2-methyl-1,4-naphthoquinone, with a 3-phytyl substituent

Similar
vitamin K1phylloquinone
Broader
vitamin Knaphthoquinoneantihemorrhagic factor
Also see
phylloquinonevitamin k1

Synonym sets from Open English WordNet, CC BY 4.0.

Cite this entry
APA

phytonadione. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/phytonadione

MLA

“phytonadione.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/phytonadione. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “phytonadione,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/phytonadione.

Source: phytonadione on Wiktionary, CC BY-SA 4.0.