Synonym(s):

• degree of aperture
• height₂
• vowel height

Source(s):

ONISHI 1981385 (degree of the opening)
HARTMANN & STORK 197216
NASH 196853, 218 (degré d'aperture / size of opening, degré d'ouverture / degree of aperture)

• ONISHI, Masao. (1981) A Grand Dictionary of Phonetics. Tokyo: The Phonetic Society of Japan. 
• HARTMANN, R.R.K. & STORK, F.C. (1972) Dictionary of Language and Linguistics. London: Applied Science Publishers.
• NASH, Rose. (1968) Multilingual Lexicon of Linguistics and Philology: English, Russian, German, French. Coral Gables, FL: University of Miami Press. 

Domain:

Phonology