insectyoudaoicibaDictYouDict
insect: [17] The Greek word for ‘insect’ was éntomon (source of English entomology [18]). It was derived from entémnein ‘cut up’, a compound verb formed from en- ‘in’ and témnein ‘cut’ (a close relative of English tome), and denoted literally ‘creature divided up into segments’. The term was translated literally into Latin as insectum (originally the past participle of insecāre, a compound verb formed from inand secāre ‘cut’), and seems to have been introduced into English in Philemon Holland’s translation of Pliny’s Natural History 1601.
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insect (n.)youdaoicibaDictYouDict
c. 1600, from Latin (animal) insectum "(animal) with a notched or divided body," literally "cut into," from neuter past participle of insectare "to cut into, to cut up," from in- "into" (see in- (2)) + secare "to cut" (see section (n.)). Pliny's loan-translation of Greek entomon "insect" (see entomology), which was Aristotle's term for this class of life, in reference to their "notched" bodies.

First in English in 1601 in Holland's translation of Pliny. Translations of Aristotle's term also form the usual word for "insect" in Welsh (trychfil, from trychu "cut" + mil "animal"), Serbo-Croatian (zareznik, from rezati "cut"), Russian (nasekomoe, from sekat "cut"), etc.