Anatomy A muscular membranous partition separating the abdominal and thoracic cavities and functioning in respiration. Also called midriff.
A membranous part that divides or separates.
A thin disk, especially in a microphone or telephone receiver, that vibrates in response to sound waves to produce electric signals, or that vibrates in response to electric signals to produce sound waves.
A contraceptive device consisting of a thin flexible disk, usually made of rubber, that is designed to cover the uterine cervix to prevent the entry of sperm during sexual intercourse.
A disk having a fixed or variable opening used to restrict the amount of light traversing a lens or optical system.
[Middle English diafragma, from Late Latin diaphragma, midriff, from Greek, partition, from diaphrassein, to barricade : dia-, intensive pref.; see dia- + phrassein, phrag-, to enclose.] di'a·phrag·mat'ic (-frāg-māt'ĭk) adj., di'a·phrag·mat'i·cal·ly adv.