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- (Received Pronunciation) IPA(key): /ˌbɹæd.ɪˈkʌɪ.nɪn/
- (General American) IPA(key): /ˌbɹeɪ.dəˈkaɪ.nɪn/
- (biochemistry) A compound released in the blood in some circumstances which causes contraction of smooth muscle and dilation of blood vessels. It is a peptide with nine amino-acid residues.