Etymology
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insecticide (n.)

"substance which kills insects," 1866 (from 1865 as an adjective), from insect + -cide "killing." Earlier as a type of machine (1856). Related: Insecticidal (1857).

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Definitions of insecticide

insecticide (n.)
a chemical used to kill insects;
Synonyms: insect powder
From wordnet.princeton.edu