Etymology
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exterminator (n.)

c. 1400, "an angel who expels (people from a country)," from Late Latin exterminator, from past-participle stem of Latin exterminare  "drive out, expel, put aside, drive beyond boundaries," also, in Late Latin "destroy" (see exterminate). As a substance for ridding a place of rats, etc., by 1848; as a person whose job it is to do this, by 1938. Old English glossed Latin exterminator with ofdræfere ("off-driver").

updated on February 25, 2022

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Definitions of exterminator from WordNet

exterminator (n.)
someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects);
Synonyms: terminator / eradicator
From wordnet.princeton.edu, not affiliated with etymonline.