Origin: δια/dia(=across)+ φράγμα/fragma(=barrier) to indicate any partision between two cavities by a membrane
Coined : 17th cen
1)The muscle that separates the thorax from the abdomen consisting the main muscle of respiration. Contraction of the diaphragm muscle expands the lungs during inspiration lowering its internal pressure.
2) a semipermeable membrane .