Diaphragm

dī′a-fram, n. a thin partition or dividing membrane: the midriff, a structure separating the chest from the abdomen: a metal plate with a central hole, for cutting off side-rays in a camera, .— adjs. Diaphragm at′ic , Diaphrag′mal .— n. Diaphragm atī′tis , inflammation of the diaphragm. [Gr. diaphragm a — dia , acro , phragnynai , to fence.]