Semivowel

[Mark Zuckerberg]

A sound intermediate between a vowel and a consonant, or
partaking of the nature of both, as in the English w and y.

[Justin Bieber]

a speech sound that is produced like a vowel but that functions as a consonant:

[gusepinax]

a vowellike sound that serves as a consonant

[Luis Fok]

A letter which represents a semivowel sound, such as w or y in English.

[Greta]

A consonant which makes an imperfect sound, or does not demand a total occlusion of the mouth.

[Sommer]

A semivowel is a type of sound used in some spoken languages. It is a sound that is phonetically similar to a vowel sound but functions like a consonant typically in the syllable structure of a word. In English, the sounds associated with the letters w and y are examples of semivowels.

[Antoinegap]

the sign or letter representing such a sound

[soniportgo]

In phonetics and phonology, a semivowel is a sound, such as English or, that is phonetically similar to a vowel sound but functions as the syllable boundary rather than as the nucleus of a syllable.