decongestive /diːkənˈdʒɛstɪv/adjective 1noun 1forms 3 adjective1 •Serving to decongest.The preferred therapy for lymphedema, called complete decongestive therapy, involves a time- and labor-intensive gentle massage technique to stimulate new pathways for the lymphatic fluid. — 2007 noun1 •A decongestant. formsdecongestives · more decongestive · most decongestive