An inhalation.

(intransitive) To draw air into the lungs, through the nose or mouth by action of the diaphragm.

(transitive) To draw air or any form of gas (either in a pure form, or mixed with small particles in form of aerosols/smoke -sometimes stemming from a medicament) into the lungs, through the nose or mouth by action of the diaphragm.

(transitive, figuratively) To eat very quickly.