Semivowels, also known as glides or non-syllabic vowels, are vowels that form diphthongs with full syllabic vowels. That is, they are vowel-like sounds that don't form the nucleus of a syllable or mora; they are not the most prominent part of the syllable. They are normally written by adding the IPA non-syllabicity mark to a vowel letter, but often for simplicity the vowel letter alone is written. Semivowels may contrast with approximants, which are similar to but closer than vowels or semivow… (More on Semivowel)