(countable, organic chemistry) The unsaturated six-membered heterocycle having four carbon atoms, two oxygen atoms, and two double bonds (molecular formula C₄H₄O₂); 1,2-dioxin and 1,4-dioxin.

plural of dioxin

(organic chemistry) An indol obtained by the reduction of isatin.

Alternative form of dioxindol

plural of dioxindole