Definition of dilator in English:



  • 1A thing that dilates something, in particular.

    • ‘Tunnel dilators were used routinely for tunnel preparation and may have contributed to the absence of any gross failures.’
    • ‘The investigated nasal dilator had no effect on sleep-related breathing disorders in patients with moderate to severe OSA.’
    • ‘However, the majority of bed partners reported a mild reduction in snoring when their spouse used the nasal dilator.’
    • ‘The dilator is designed to provide a gentle expanding force to the nasal wall tissue when the dilator is adhesively attached to the nose.’
    • ‘The main finding of this study was that the objective measurements of snoring and apneas during sleep were almost unaffected by the Nozovent nasal dilator.’
    • ‘The nasal dilator functions by increasing the area of the nasal passages, therefore decreasing resistance to airflow during nasal breathing.’
    • ‘Losing the nasal dilator during sleep was documented by the patients.’
    • ‘The dilators do have some other uses.’
    • ‘O'Kroy and the team of researchers found no significant differences between the placebo and the active nasal dilator regarding the total work of breathing.’
    1. 1.1Anatomy A muscle whose contraction dilates an organ or aperture, such as the pupil of the eye.
      • ‘The size of the opening is controlled by the nervous system: at rest, the parasympathetic nervous system constricts the pupil and in danger, the sympathetic nervous system supplies the pupillary dilator muscle to enlarge the pupil.’
      • ‘The hypoglossal and glossopharyngeal nerves innervate pharyngeal dilator muscles.’
      • ‘The halecostomes, of which Amia is an example, have an opercular dilator muscle originating on the mandible which opens the operculum.’
      • ‘It is possible that differences in anatomy may do so by altering the effectiveness of pharyngeal dilators.’
      • ‘They are counterbalanced by the traction and stiffening of UA tissues resulting from the contraction of dilator muscles.’
    2. 1.2A surgical instrument for dilating a tube or cavity in the body.
      • ‘The anesthesia care provider takes special care to ensure the removal of all esophageal tubes during insertion of sizing tubes, such as bougie dilators.’
      • ‘The dilator is removed and the nasogastric tube placed through the gastrojejunostomy and into the Roux limb.’
      • ‘Other children may require periodic dilatation with tracheal dilators.’
      • ‘In less urgent cases sequential dilation, for example, with either balloons or semirigid dilators, is preferred.’
      • ‘Interestingly, in one of these reports all stenoses were at the level of the tracheostomy, and the authors suggested that tracheal damage from the inward force of the graded dilators might be the cause.’
    3. 1.3A vasodilatory drug.
      • ‘Nitric oxide, a principle physiological dilator, produces local vasodilatation and inhibits platelet adherence and aggregation.’
      • ‘Its positive benefits are that it is a social stimulant and a potent dilator of the bronchial muscles, so it is important in the treatment of asthma.’
      • ‘Fifteen to 20 minutes later, after use of a nebulized bronchial dilator, the patient had acquired a measure of control over his breathing.’
      • ‘Theophylline (and aminophylline, a complex of theophylline and ethylenedimine) are bronchial dilators and are usually bought over the counter although they are prescribed.’
      • ‘The latter include diuretics, cardiac dilators and a substance called pentoxifylline, usually proscribed for memory loss among the aged.’