Definitions of diaphragm

  1. a contraceptive device consisting of a flexible dome- shaped cup made of rubber or plastic; it is filled with spermicide and fitted over the uterine cervix
  2. a mechanical device in a camera that controls size of aperture of the lens; " the new cameras adjust the diaphragm automatically"
  3. electro- acoustic transducer that vibrates to receive or produce sound waves
  4. A dividing membrane or thin partition, commonly with an opening through it.
  5. The muscular and tendinous partition separating the cavity of the chest from that of the abdomen; the midriff.
  6. A calcareous plate which divides the cavity of certain shells into two parts.
  7. A plate with an opening, which is generally circular, used in instruments to cut off marginal portions of a beam of light, as at the focus of a telescope.
  8. A partition in any compartment, for various purposes.
  9. A thin partition or dividing membrane: the muscle which separates the chest from the abdomen; called also the midriff.
  10. Partition; muscular partition separating the chest from the abdomen.
  11. The midriff or large circular muscle separating the chest or thorax from the abdomen or lower belly, and forming a movable partition between these two cavities, its most important office being connected with the function of respiration; any partition, commonly with an opening through it, especially in optical instruments, to cut off superfluous rays.
  12. The midriff; a muscle or membrane separating the chest or thorax from the abdomen or belly; any substance that intercepts or divides.
  13. The wall which separates the small cell, the prothallus, from the rest of the macrospore in Hydropterideae; a septum at the nodes in Equisetum; a sheet of muscular tissue attached to the introvert in worms; the single strongly developed septum in the Terebelliformia; the perforated tissue that subdivides the tentacle cavity in Polyzoa; the transverse septum separating the cephalothorax from the abdomen in certain Arachnids; a special fan- shaped muscle spreading from the anterior end of the ilia to the oesophagus and base of the lungs in Anura; a partition partly muscular, partly tendinous, separating the cavity of the chest from the abdominal cavity.