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Medical Dictionary

1

strain

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noun \ˈstrān\

Medical Definition of strain

  1. :  a group of presumed common ancestry with clear-cut physiological but usually not morphological distinctions <a highly virulent strain of bacteria>




2

strain

transitive verb

Medical Definition of strain

  1. 1a:  to exert (as oneself) to the utmostb:  to injure by overuse, misuse, or excessive pressure <strained his heart by overwork>c:  to cause a change of form or size in (a body) by application of external force

  2. 2:  to cause to pass through a strainer

  3. intransitive verb

  4. :  to contract the muscles forcefully in attempting to defecate—often used in the phrase strain at stool




3

strain

noun

Medical Definition of strain

  1. :  an act of straining or the condition of being strained: asa:  excessive physical or mental tension; also :  a force, influence, or factor causing such tensionb:  bodily injury from excessive tension, effort, or use <heart strain>; especially :  one resulting from a wrench or twist and involving undue stretching of muscles or ligaments <back strain>—compare sprainc:  deformation of a material body under the action of applied forces





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