Definition of dilatation in US English:



Medicine Physiology
  • 1The action of dilating a vessel or opening or the process of becoming dilated.

    • ‘Ten of 12 patients with predominantly extrinsic compression of the central airways underwent dilatation using a high-pressure balloon catheter.’
    • ‘Between 14 and 19 weeks of pregnancy, a process known as surgical dilatation and evacuation (often referred to as D & E) may be used.’
    • ‘Interventional paediatric cardiology mainly involves dilatation of stenotic vessels or valves and occlusion of abnormal communications.’
    • ‘The overall rate of oesophageal perforation after flexible endoscopy involving oesophageal instrumentation, biopsy, or dilatation is 2.6%.’
    • ‘He had undergone a dilatation for an ‘esophageal stricture’ about 5 years ago for similar problems at another institution.’
    enlargement, increase in size, swelling, distension, dilation
    View synonyms
    1. 1.1 A dilated part of a hollow organ or vessel.
      • ‘The saccular or cystic form is the most severe type and is characterized by a ballooning of the bronchi with fluid-filled, sac-like dilatations.’
      • ‘The best known and most extensively studied baroreceptors are those in the carotid sinuses, dilatations of the carotid arteries in the neck.’
      expansion, growth, increase in size, extension, amplification, augmentation, topping up, building up, addition, supplementing
      View synonyms


Late Middle English: via Old French from late Latin dilatatio(n-), from the verb dilatare (see dilate).