Vowel
In phonetics, a vowel is a sound in spoken language that is characterized by an open configuration of the vocal tract so that there is no build-up of air pressure above the glottis. This contrasts with consonants, which are characterized by a constriction or closure at one or more points along the vocal tract. A vowel is also understood to be syllabic: an equivalent open but non-syllabic sound is called a semivowel.
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vowel sound
Noun
1. a speech sound made with the vocal tract open
(synonym) vowel
(hypernym) phone, speech sound, sound
(hyponym) ablaut