Main Entry: naph·tho·qui·none

Variant(s): also naph·tha·qui·none \ˌnaf-thə-kwin-ˈōn, ˌnap-, -ˈkwin-ˌōn\

Function: noun

: any of three isomeric yellow to red crystalline compounds C₁₀H₆O₂ derived from naphthalene ; especially : one that occurs naturally in the form of derivatives (as vitamin K)