plastoquinone
noun
plas·to·qui·none ˌpla-(ˌ)stō-kwi-ˈnōn 
-ˈkwi-ˌnōn
-ˈkwi-ˌnōn : a plant substance that is related to vitamin K and plays a role in photosynthetic phosphorylation
Word History
Etymology
Greek plastos + English quinone
First Known Use
1958, in the meaning defined above
Medical Definition
plastoquinone
noun
plas·to·qui·none ˌplas-(ˌ)tō-kwin-ˈōn -ˈkwin-ˌōn
-ˈkwin-ˌōn : any of a group of substances that occur mostly in plant chloroplasts, are related to vitamin K, and play a role in photosynthetic phosphorylation