Standard Lemma guide

menaquinone

noun · 1 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • Received-Pronunciation: /ˌmɛn.əˈkwɪn.əʊn/
  • General-American: /ˌmɛn.əˈkwɪˌnoʊn/

1

noun

Meaning 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.

Definition source: English Wiktionary via Wiktextract

Topics: biochemistry, biology, chemistry, medicine, microbiology, natural-sciences, pharmacology, physical-sciences, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Etymology tree Proto-Indo-European *médhu Proto-Hellenic *méthu Ancient Greek μέθυ (méthu) Proto-Indo-European *swel-der.? Ancient Greek ῡ̔́λη (hū́lē)der. German -yl German Methylbor. English me(thyl) English na(phtho)quinone English menaquinone From me(thyl) + na(phtho)quinone.