menadione

noun

men·​a·​di·​one ˌme-nə-ˈdī-ˌōn 

-dī-ˈōn

: a yellow crystalline synthetic compound C₁₁H₈O₂ that is a provitamin converted to vitamin K₂ in the body

called also vitamin K₃

Word History

Etymology

methyl + napthalene + di- + ketone

First Known Use

1941, in the meaning defined above

Medical Definition

menadione

noun

men·​a·​di·​one ˌmen-ə-ˈdī-ˌōn, -dī-ˈ 

: a yellow crystalline synthetic naphthoquinone compound C₁₁H₈O₂ that is a provitamin converted to vitamin K₂ in the body

called also vitamin K₃