2 definitions found From WordNet (r) 2.0 [wn]: aerator noun: an apparatus for exposing something to the air (as sewage) From The Collaborative International Dictionary of English v.0.44 [gcide]: aerator \aerator\, Aerator \A"["e]r*a'tor\, noun 1. That which supplies with air or gas; specif.: (a) An apparatus used for charging mineral waters with gas and in making soda water. (b) A fumigator used to bleach grain, destroying fungi and insects. [Webster 1913 Suppl.] 2. an apparatus for exposing something to the air (as sewage). [WordNet 1.5]

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