- The definition of a diaphragm is any thin material that creates a partition.
- The thick muscular partition that separates your thorax from your abdomen is an example of a diaphragm.
- A barrier that fits over the cervix and prevents pregnancy is an example of a diaphragm.
- A part of a camera that controls the size of the lens' aperture is an example of a diaphragm.
- the partition of muscles and tendons between the chest cavity and the abdominal cavity; midriff
- any membrane or partition that separates one thing from another
- a dividing wall at the node of a plant stem
- a device to regulate the amount of light entering the lens of a camera, microscope, etc.
- ☆ a small, flexible contraceptive device of rubber or plastic that fits over the cervix of the uterus
- a thin, flexible disk or cone that vibrates in response to sound waves to produce electrical signals, as in a microphone, or that vibrates in response to electrical signals to produce sound waves, as in a speaker
Origin of diaphragmMiddle English diafragma ; from Late Latin diaphragma ; from Classical Greek ; from dia-, through + phragma, a fence ; from phrassein, to enclose
- 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.
Origin of diaphragmMiddle English diafragma, from Late Latin diaphragma, midriff, from Greek, partition, from diaphrassein, to barricade : dia-, intensive pref.; see dia– + phrassein, phrag-, to enclose.
- (anatomy) In mammals, a sheet of muscle separating the thorax from the abdomen, contracted and relaxed in respiration to draw air into and expel air from the lungs; also called thoracic diaphragm.
- (anatomy) Any of various membranes or sheets of muscle or ligament which separate one cavity from another.
- A contraceptive device consisting of a flexible cup, used to cover the cervix during intercourse.
- (mechanics) A flexible membrane separating two chambers and fixed around its periphery that distends into one or other chamber depending on the as the difference in the pressure in the chambers varies.
- (acoustics) In a speaker, the thin, semi-rigid membrane which vibrates to produce sound.
- (optics, photography) A thin opaque structure with a central aperture, used to limit the passage of light into a camera or similar device.
- (chemistry) A permeable or semipermeable membrane
- (construction) A floor slab, metal wall panel, roof panel or the like, havig a sufficiently large in-plane shear stiffness and sufficient strength to transmit horizontal forces to resisting systems.
(third-person singular simple present diaphragms, present participle diaphragming, simple past and past participle diaphragmed)
- (optics, photography) To reduce lens aperture using an optical diaphragm.
- To act as a diaphragm, for example by vibrating.
From Ancient Greek διάφραγμα (diáphragma, “partition”), from διά (dia, “across”) and φράγμα (phragma, “barrier”), from the verb φράσσω (phrasso)..