delayed allergy delayed-action fuse • delayer · · · Info · Definitions · Synonyms · Characters · · delayed allergy · · Text Common · · Latin · · Scripts 15 · · Length 6 · · Syllables Definitions · · · (noun) an allergic reaction that becomes apparent only hours after contact. Synonyms: delayed allergy, type IV allergic reaction. · · Noun Definition 1 Synonyms · · · type iv allergic reaction · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 g latin small letter g U+0067 l latin small letter l U+006C r latin small letter r U+0072 y latin small letter y U+0079