Retrieving "Oral Passage Area" from the archives

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1. Aperture

   Linked via "oral passage area"

   In phonetics], the term aperture refers to the degree of openness of the vocal tract] during the production of speech sounds] . Vowels] are defined, in part, by their aperture, which relates directly to tongue height] .
   A high vowel (e.g., [i] as in see) is produced with a narrow vocal aperture, meaning the tongue] is raised high in the mouth], restricting airflow] significantly but without causing frictio…