glottis

noun

Etymology: Late 16th century borrowing from New Latin glōttis, from Ancient Greek γλωττῐ́ς (glōttĭ́s, “mouth of the windpipe”), from γλῶττᾰ (glôttă, “tongue”) + -ῐς (-ĭs, feminine noun suffix). Cognates include Latin gula.

1. The opening between the true vocal cords which is located in the larynx and affects voice modulation through expansion or contraction.