semivowel
noun
- transitional phoneme produced like a vowel but used like a syllable boundary
Wiktionary
noun
Etymology: Etymology tree Proto-Indo-European *sem- Proto-Indo-European *sēmi Latin sēmi-bor. English semi- English vowel English semivowel From semi- + vowel.
- A sound in speech which has some qualities of a consonant and some qualities of a vowel.
- A letter which represents a semivowel sound, such as w or y in English.