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.

physical and psychological dependency on an addictive drug

any hazard that results from the accidental, deliberate or potential release of a noxious substance into the environment

(nautical) a horn on a floating mine which, upon contact, releases an electrolyte that makes an electrical connection and initiates the explosion

(chemistry) the study of the reaction rates of chemical reactions, especially as a means of elucidating reaction pathways or mechanisms

(chemistry) the unique combination of analytical results from a number of techniques that identifies a particular compound in a sample

any laser that obtains its energy from a chemical reaction

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