Diaphragmatic is an adjective used to describe something related to or involving the diaphragm. Synonyms for diaphragmatic include phrenic, thoracic, respiratory, pulmonary, and breathing related. Phrenic refers specifically to the phrenic nerve which controls the diaphragm. Thoracic describes the cavity in which the diaphragm is situated. Respiratory and pulmonary both refer to the respiratory system and the lungs which the diaphragm helps to expand and contract. Breathing related includes anything that affects or is related to breathing, which is directly affected by the diaphragm. These synonyms can provide variety and precision in writing about anything related to the diaphragm.