Etymology
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aerator (n.)

"a blower," also "an apparatus for forcing air or carbon dioxide into water or other liquids," 1861, agent noun from aerate (v.).

updated on September 15, 2022

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Definitions of aerator from WordNet

aerator (n.)
an apparatus for exposing something to the air (as sewage);
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.