membrane

• The membrane can be:

  generally: a thin elastic membrane or disc
  in biology:
  a thin membrane with a delimiting or separating function
  biological membrane
  cytoplasmic membrane
  in engineering, physics and chemistry:
  selectively permeable membrane for separation of mixtures (e.g. by dialysis, ultrafiltration) and similar purposes, see membrane (chemistry)
  in announcement technology: a thin plate (or paper cone) that transmits sound waves on an electrical device in an electroacoustic transducer (e.g. in a microphone or loudspeaker), see diaphragm (sound technology)
  diaphragm pump, see under diaphragm pump
  diaphragm
  in superstring theory etc.: 2-brane, i.e. a special p-brane with two spatial dimensions, see membrane (superstring theory)
  in construction: abbreviated: building membrane