# menaquinone

> English word · Noun · IPA /ˌmɛn.əˈkwɪn.əʊn/

## Definitions
1. 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.

## Etymology
From me(thyl) + na(phtho)quinone.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/menaquinone