That branch of natural history which deals with the physiology, distribution, and classification of insects.

A term formerly used in same sense as entomology, n., the science of insects as a branch of Zoology; now usually applied to the study of insects in…

The study of insects or other bugs (bug, n.2 1); entomology.

the action or practice of searching for or collecting insects or other bugs (sense 1), esp. as entomological specimens.