Semivowel
/ˈsemivaʊəl/
Definition 1 of 1
Pro Tip 1/3Pronunciation Clarity
Semivowels are less forceful than full vowels, so they're not the main sound in syllables. 
In the word 'quiet,' the 'w' is a semivowel.
Pro Tip 2/3Confusion Avoidance
Don't mistake semivowels for similar vowel sounds; they're more like softened consonants. 
The 'y' in 'you' is a semivowel, not a pure vowel like in 'eye.'
Pro Tip 3/3Voiced Quality
Semivowels can be voiced, meaning your vocal cords vibrate like they do for vowels. 
The 'r' in 'red' is a voiced semivowel.