plastoquinone
/ˌplastə(ʊ)ˈkwɪnəʊn/Biochemistry
noun
Any of a homologous series of compounds which have a quinone nucleus with a terpenoid side chain; specifically one of these occurring in the chloroplasts of plants and involved in electron transfer during photosynthesis.
Origin
1950s. From plast- + -o- + quinone.