(chemistry) any substance used to classify another, often by changing colour

Any symptom, such as erythema, edema, and vesiculation, caused by exposure of the skin to a chemical compound.

The study of the chemistry of the oceans.

Any compound that serves to transmit a message.

(chemistry) the fragmentation of any compound into elements or smaller compounds

A medical treatment using a anaphrodisiacal hormonal drug to inhibit the function of a man's testes, intended to have the same effect on the sex drive as surgical castration. It is typically used on sex offenders as a punishment and/or preventative measure, or on people wishing to undergo male-to-female transsexualism.

the study of the effects of chemical compounds on the interactions of living organisms

(pathology) clinical chemistry.

(physics, chemistry) The identities, and relative numbers, of the elements that make up any particular compound

(chemistry) Any of the laws of nature that are relevant to chemistry.