dilation (dI-la´shun)

1. Physiologic or artificial enlargement of a hollow structure or opening. 2. The act of stretching or enlarging an opening or the lumen of a hollow structure.dilatation; [L. dilato, pp. dilatatus, to spread out, dilate]
post-stenotic d. d. of an artery, most commonly the pulmonary artery or the aorta, distal to an area of narrowing.
urethral d. increasing the caliber of the urethra by passage of a dilator.


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