menaquinone
Concise Oxford English Dictionary © 2008 Oxford University Press:
menaquinone /ˌmɛnəˈkwɪnəʊn/
▶noun Biochemistry a member of the vitamin K group, a compound produced by intestinal bacteria and essential for the blood-clotting process.
– origin 1940s: from the chemical name me(thyl)-na(phtho)quinone.
'menaquinone' also found in these Oxford entries:

