abdominodiaphragmatic breathing /æbˌdɑm.ɪ.noʊ.di.ə.fɹæɡˈmæt.ɪk bɹiːðɪŋ/ noun1 •A type of breathing used to treat dyspnea, where the patient used the abdominal muscles for the expiration and the diaphragm for the inspiration.