menaquinone

From me(thyl) +‎ na(phtho)quinone.

• (Received Pronunciation) IPA^(key): /ˌmɛn.əˈkwɪn.əʊn/
• (General American) IPA^(key): /ˌmɛn.əˈkwɪˌnoʊn/

menaquinone (plural menaquinones)

1. (biochemistry, pharmacology) A pale yellow crystalline naphthoquinone C₄₁H₅₆O₂ that is obtained especially from putrefied fish meal and produced by bacteria in the large intestine and essential for the blood-clotting process. It is much more unsaturated than vitamin K₁ and slightly less active biologically, and is an isoprenoid derivative of menadione.

• vitamin K₂

• menatetrenone

• naphthoquinone
• vitamin K

• “menaquinone”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.
• “menaquinone”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.