— dilatational , adj.
/dil'euh tay"sheuhn, duy'leuh-/ , n.
1. a dilated formation or part.
2. Pathol. an abnormal enlargement of an aperture or a canal of the body.
3. Surg.
a. an enlargement made in a body aperture or canal for surgical or medical treatment.
b. a restoration to normal patency of an abnormally small body opening or passageway, as of the anus or esophagus.
4. Mech. the increase in volume per unit volume of a homogeneous substance.
Also, dilation .
[ 1350-1400; ME ( dilatation- (s. of dilatatio ), equiv. to dilatat ( us ) spread out (ptp. of dilatare to DILATE) + ion- -ION ]