diaphragm

Universal Words noun 1 (anatomy) the layer of muscle between the lungs and the stomach, used especially to control breathing 2 (BrE also cap) a rubber or plastic device that a woman places inside her VAGINA before having sex to prevent SPERM from entering the WOMB and making her pregnant 3 any thin piece of material used to separate the parts of a machine, etc. 4 (technical) a thin disc used to turn electronic signals into sound and sound into electronic signals in telephones, LOUDSPEAKERS, etc.