Source : Webster's Revised Unabridged Dictionary (1913)

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 : WordNet®

entomology
     n : the branch of zoology that studies insects [syn: {bugology}]