curcuminoid

thumb|right|200px|Curcumin thumb|right|200px|Demethoxycurcumin thumb|right|200px|Bisdemethoxycurcumin

A curcuminoid is a linear diarylheptanoid, a relatively small class of plant secondary metabolites that includes curcumin, demethoxycurcumin, and bisdemethoxycurcumin, all isolated from turmeric (curcuma longa). These compounds are natural phenols and produce a pronounced yellow color that is often used to color foods and medicines. Curcumin is obtained from the root of turmeric.