glottis

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glottis

the vocal apparatus of the larynx, consisting of the two true vocal cords and the opening between them
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

glottis

[′gläd·əs]
(anatomy)
The opening between the margins of the vocal folds.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.