Definition of semivowel noun from the Oxford Advanced American Dictionary

 

semivowel

 noun
noun
NAmE//ˈsɛmiˌvaʊəl//
 
(phonetics)
 
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a speech sound that sounds like a vowel but functions as a consonant, for example/w/ and/y/ in the English words wet and yet
See the Oxford Advanced Learner's Dictionary entry: semivowel