Definition of menadione in English:


Syllabification: men·a·di·one
Pronunciation: /ˌmenəˈdīˌōn


  • A synthetic yellow compound related to menaquinone, used to treat hemorrhage. Also called vitamin K3 (see vitamin K).
    • Alternative name: 2-methyl-1,4-naphthoquinone; chemical formula: C11H8O2
    More example sentences
    • This medium is prepared twice each week and is complemented with 8% sheep blood, menadione, and gentamicin, making this medium selective for anaerobes.
    • The K vitamins exist naturally as K 1 in green vegetables and K 2 produced by intestinal bacteria and K 3 is synthetic menadione.
    • After absorption, menadione is thought to become alkylated into biologically active isoprenylated menaquinones.


1940s: from me(thyl) + na(phthalene) + the suffix -dione, used in names of compounds containing two carbonyl groups.

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