A substance is "any (chemical) element or compound composed of uniform units.

Composition H6 is a castable military explosive compound composed of the following percentages by weight:

Iron oxides are chemical compounds composed of iron and oxygen.

Lead carbonate is a compound composed of lead and carbonate ions.

Dibenzyl ketone, or 1,3-diphenylacetone, is an organic compound composed of two benzyl groups attached to a central carbonyl group.

Nitro blue tetrazolium is a chemical compound composed of two tetrazole moieties.

Styrene is a compound composed of carbon and hydrogen.

In chemistry, titanate usually refers to inorganic compounds composed of titanium oxides.

Pteridine is a chemical compound composed of fused pyrimidine and pyrazine rings.

In chemistry, a carbide is a compound composed of carbon and a less electronegative element.