From Longman Dictionary of Contemporary Englishdecongestantde‧con‧gest‧ant /ˌdiːkənˈdʒestənt◂/ noun [countable, uncountable] MHmedicine that you can take if you have a cold, to help you breathe more easily
Examples from the Corpus
decongestant• No aromatic oils, vapour rubs, smelly nasal decongestants like menthol or eucalyptus etc. 