the branch of zoology dealing with insects.

1760–70; entomo- + -logy

entomological [en-tuh-muh-loj-i-kuhl] , entomologic, adjective
entomologically, adverb
entomologist, noun
nonentomologic, adjective
nonentomological, adjective
unentomological, adjective

entomology, etymology.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
entomology (ˌɛntəˈmɒlədʒɪ)
the branch of science concerned with the study of insects

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1766, from Fr. entomologie (1764), coined from Gk. entomon "insect" + logia "study of." Entomon is neut. of entomos "having a notch or cut (at the waist)," so called by Aristotle in reference to the segmented division of insect bodies, from en- "in" + temnein "to cut." Compare insect.
"I have given the name insectology to that part of natural history which has insects for its object; that of entomology ... would undoubtedly have been more suitable ... but its barbarous sound terryfy'd me." [Charles Bonnet's Eng. translation of his "Contemplation de la nature," 1766]
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

entomology en·to·mol·o·gy (ěn'tə-mŏl'ə-jē)
The study of insects.

en'to·mo·log'ic (-mə-lŏj'ĭk) or en'to·mo·log'i·cal (-ĭ-kəl) adj.
en'to·mol'o·gist n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
entomology   (ěn'tə-mŏl'ə-jē)  Pronunciation Key 
The scientific study of insects.

Our Living Language  : Scientists who study insects (there are close to a million that can be studied!) are called entomologists. Why are they not called "insectologists"? Well, in a way they are. The word insect comes from the Latin word insectum, meaning "cut up or divided into segments." (The plural of insectum, namely insecta, is used by scientists as the name of the taxonomic class that insects belong to.) This Latin word was created in order to translate the Greek word for "insect," which is entomon. This Greek word also literally means "cut up or divided into segments," and it is the source of the word entomology. The Greeks had coined this term for insects because of the clear division of insect bodies into three segments, now called the head, thorax, and abdomen.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
She said he is an honor student and hopes to become an entomologist.
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