Entomology \En`to*mol"o*gy\, n.; pl. Entomologies. [Gr. 'e`ntomon insect (so called because nearly cut in two, fr. 'e`ntomos cut in; 'en in + te`mnein to cut) + -logy: cf. F. entomologie. See In, and Tome, and cf. Insect.]

1. That part of zo["o]logy which treats of insects.

2. A treatise on the science of entomology.

Source: Webster's Revised Unabridged Dictionary (1913)