Etymology
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rhonchus (n.)

plural rhonchi, "dry sound heard in the bronchial tubes," 1829, from Latinized form of Greek rhenkhos, rhankos, properly "a snoring, snorting," from rhenkein "to snore, snort," which is of imitative origin. Related: Rhonchal; rhonchial.

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Definitions of rhonchus

rhonchus (n.)
a sound like whistling or snoring that is heard with a stethoscope during expiration as air passes through obstructed channels;
From wordnet.princeton.edu