Etymology
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decongestant (n.)

"a decongestive agent," by 1950; see de- + congest + -ant. Related: Decongestion (1901); decongest (v.), by 1912; decongestive (adj.), by 1922.

updated on September 17, 2018

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Definitions of decongestant from WordNet

decongestant (n.)
a drug that decreases pulmonary congestion;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.