cardinal vowel
noun/ˌkɑːdɪnl ˈvaʊəl/
/ˌkɑːrdɪnl ˈvaʊəl/
(phonetics)- one of a set of vowels that are used as reference points when describing the vowels in a particular language
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cardinal vowel
Definition of cardinal vowel noun from the Oxford Advanced Learner's Dictionary