the vocal apparatus of the larynx; the true vocal folds and the space between them where the voice tone is generated
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Webster's Dictionary (GCIDE)
Glottis \Glot"tis\, n. [NL., fr. Gr. ?, ?, from ?, ?, the tongue. See Gloss an explanatory remark.] (Anat.) The opening from the pharynx into the larynx or into the trachea. See Larynx. [1913 Webster]