a harsh, grating, or creaking sound.
Pathology. a harsh respiratory sound due to any of various forms of obstruction of the breathing passages.

1625–35; < Latin strīdor, equivalent to strīd(ēre) (see strident) + -or -or1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stridor (ˈstraɪdɔː)
1.  pathol a high-pitched whistling sound made during respiration, caused by obstruction of the air passages
2.  literary chiefly a harsh or shrill sound
[C17: from Latin; see strident]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

stridor stri·dor (strī'dər, -dôr')
A high-pitched noisy sound occurring during inhalation or exhalation, a sign of respiratory obstruction.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
He had been admitted to the hospital because of increasing stridor, a high-pitched sound made during inhalation.
Conditions other than croup can cause that rasping-stridor-but those diseases are far more serious.
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