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dilatation (dil″ә-ta´shәn)   the condition, as of an orifice or tubular structure, of being dilated or stretched beyond normal dimensions by medications or instrumentation.
  the act of dilating or stretching.
 

dilatation and curettage(D & C)    expanding of the ostium uteri to permit scraping of the walls of the uterus, a common technique used in induced abortion.

dilatation of the heart  compensatory enlargement of the cavities of the heart, with thinning of the walls.





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