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 (dī-lā′tər, dī′lā′-, dĭ-lā′-)
1. A muscle that dilates a body part, such as a blood vessel or the pupil of the eye.
2. An instrument that dilates a body part, such as a cavity, canal, or orifice.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(daɪˈleɪtə; dɪ-) or




(ˌdaɪləˈteɪtə; ˌdɪ-)
1. (Surgery) something that dilates an object, esp a surgical instrument for dilating a bodily cavity
2. (Physiology) a muscle that expands an orifice or dilates an organ
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


or di•lat•er

(daɪˈleɪ tər, dɪ-, ˈdaɪ leɪ-)

1. any muscle that dilates a part of the body.
2. a surgical instrument for performing a dilatation.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.dilator - a muscle or nerve that dilates or widens a body part
body part - any part of an organism such as an organ or extremity
2.dilator - a drug that causes dilation
drug - a substance that is used as a medicine or narcotic
vasodilative, vasodilator - a drug that causes dilation of blood vessels
3.dilator - a surgical instrument that is used to dilate or distend an opening or an organ
surgical instrument - a medical instrument used in surgery
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


n. dilatador.
1. músculo que dilata un órgano al contraerse;
2. instrumento quirúrgico para expandir o dilatar un orificio o paredes;
Hegar's ______ de Hegar, instrumento usado para dilatar el canal uterino.
English-Spanish Medical Dictionary © Farlex 2012


n dilatador m
English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
References in periodicals archive ?
From here, they divide into two long ciliary nerves to reach the iris dilator muscle. Disruption of this pathway thus can occur in any of the three levels, hence giving rise to central (first-order neuron) HS, preganglionic (second-order neuron) HS, and postganglionic (third-order neuron) HS [Figure 2].[20],[21]{Figure 2}
Epidemiological studies suggested that OSA is another common sleep-related disorder in PD.[6],[7] Previous studies reported the frequency of OSA in PD patients between 20% and 66%.[8] Upper airway obstruction plays a critical role in the pathogenesis of OSA.[9] Reduced upper airway dilator muscle activity at sleep results in an obstructive respiratory event.
Alpha1-adrenergic receptors are also found on the iris dilator muscle. (5,6) Recent studies suggest that iris dilator muscle thickness is reduced in individuals with a history of tamsulosin use.
Van de Graaff then hyperventilated seven of the dogs to induce apneas (i.e., the dogs had no dilator muscle activity).
b) It increases the response of the pupil dilator muscle
Cocaine acts by blocking reuptake of norepinephrine in the neuromuscular junction of the iris dilator muscle, causing the pupil in a normal eye to dilate, while incomplete dilation is seen in Horner Syndrome.
Spielman's research team is studying how to strengthen the major dilator muscle in the throat as a potential OSA treatment.
"It is known that [OSA] patients have a smaller and more collapsible pharynx, which is compensated by increased dilator muscle activity during wakefulness.
(2) NA therefore accumulates in the synaptic cleft and stimulates the dilator muscle of the pupil.
Important components likely include pharyngeal anatomy (38,39), pharyngeal dilator muscle responsiveness to respiratory challenges during sleep (40-43), the arousal threshold (propensity to wake up from sleep) (44,45), the instability of the negative feedback control system regulating ventilation (loop gain) (46-48), and upper airway tethering via caudal traction from changes in end-expiratory lung volume (EELV) (49-52).
The ophthalmic manifestations of Homer's syndrome are caused by a loss of input to the sympathetically controlled Muller's muscle and iris dilator muscle. Ptosis occurs as a result of a dysfunction of one or both of the upper eyelid elevators--the levator palpebrae superioris and Muller's muscle.