|1.||anatomy any separating membrane, esp the dome-shaped muscular partition that separates the abdominal and thoracic cavities in mammalsRelated: phrenic|
|2.||a circular rubber or plastic contraceptive membrane placed over the mouth of the uterine cervix before copulation to prevent entrance of sperm|
|3.||any thin dividing membrane|
|4.||Also called: stop a disc with a fixed or adjustable aperture to control the amount of light or other radiation entering an optical instrument, such as a camera|
|5.||a thin disc that vibrates when receiving or producing sound waves, used to convert sound signals to electrical signals or vice versa in telephones, etc|
|a. a porous plate or cylinder dividing an electrolytic cell, used to permit the passage of ions and prevent the mixing of products formed at the electrodes|
|b. a semipermeable membrane used to separate two solutions in osmosis|
|7.||botany a transverse plate of cells that occurs in the stems of certain aquatic plants|
|[C17: from Late Latin diaphragma, from Greek, from |
diaphragm di·a·phragm (dī'ə-frām')
A musculomembranous partition separating the abdominal and thoracic cavities and functioning in respiration. Also called midriff.
A membranous part that divides or separates.
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.
|diaphragm (dī'ə-frām') Pronunciation Key
A dome-shaped structure made up of muscle and connective tissue that separates the abdominal cavity from the thorax and functions in respiration. By movement of the diaphragm, air is either drawn into the lungs or forced out of them.
Note: The term diaphragm can also refer to a small flexible cap, usually made of rubber, that fits over the cervix and is used for contraception.