(chemistry, physics) The change in the nuclear magnetic resonance frequency of a nucleus depending on its electronic environment; used in NMR spectroscopy to determine the structure of molecules.

The branch of engineering that deals with the design, construction and operation of industrial process plants, and the physical, chemical and biological processes to create substances or energy in a useful and economic form.

(medicine) an extreme sensitivity, or allergic reaction, to any of various chemical compounds present in the normal environment

(chemistry) any vessel designed to hold the compounds involved in a chemical reaction; a reaction vessel

(chemistry) any group of elements whose chemical and physical properties have similarities, and that vary progressively through the series; evident within the periodic table

Any noxious substance intended for use in military or police operations.

(chemistry) Any of several attractive forces that serve to bind atoms together to form molecules

A toilet or chamber pot which treats waste in place with chemical disinfectants and deodorizers, as in airplane lavatories.

All the methods and procedures involved in defending against attack by chemical agents.

A noxious substance contained in some form of delivery system such as a shell or missile.