DIAPHRAGM By N., Pam M.S. - April 7, 2013 1. Muscle sheet that separates the abdominal cavity from the thoracic cavity. 2. Cup-shaped contraceptive device. DIAPHRAGM: "The diaphragm has been used a s a contraceptive device by women since the 1882." Related Psychology Terms VAGUS NERVE INTRAUTERINE DEVICE (IUD) SEPTUM PELLUCIDUM SOFT PALATE EXTRAUTERINE PREG PANCREAS SPHINCTER FEEDBACK DEVICE SWITCH DEVICE ERGOGRAPH Cite this page: N., Pam M.S., "DIAPHRAGM," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/diaphragm/ (accessed January 17, 2020).