(hem″e-di´ә-fram) one half of the diaphragm.
One side (one "half") of the diaphragm.
Hemidiaphragm: Half of the diaphragm, the muscle that separates the chest cavity from the abdomen and that serves as the main muscle of respiration. Both hemidiaphragms are visible on X-ray studies from the front or back. The right hemidiaphragm is protected by the liver and is stronger than the left. The left hemidiaphragm is more often subject to...