半元音是一种滑音，介于元音跟辅音之间的音段，功能上类似辅音。语音学上指擦音中气流较弱、摩擦较小、类似辅音，具有元音的语音特性，但起辅音的音系作用的非音节性音段。
半元音的 semivocal
半开元音 open-mid vowel ; half-open vowel ; semi-wide vowel
半闭元音 close-mid vowel ; semi-closed vowel ; half close vowel
半元音J semi-vowel
半闭后圆唇元音 close-mid back rounded vowel
半开后圆唇元音 open-mid back rounded vowel
半开前圆唇元音 open-mid front rounded vowel
半闭央圆唇元音 close-mid central rounded vowel
半开央圆唇元音 open-mid central rounded vowel
本文比较了近音与通音、半元音、擦音、流音、元音之间的异同，认定普通话日母是近音而非浊擦音。
This paper compares approximants with continuants, semivowels, fricatives, liquids, and vowels, and identifies the initial ri in Mandarin as an approximant rather than a voiced fricative.
音节是由一个哑音字母和一个发声字母(元音或者半元音)构成的无意义的复合声音，没有A时GR是一个音节，而有a时gra也是一个音节。
A Syllable is a nonsignificant composite sound, made up of a mute and a Letter having a sound (a vowel or semivowel); for GR, without an a, is just as much a Syllable as GRA, with an a.
音节是由一个哑音字母和一个发声字母（元音或者半元音）构成的无意义的复合声音，没有A时GR是一个音节，而有A时GRA也是一个音节。
Syllable is a nonsignificant composite sound, made up of a mute and a Letter having a sound (a vowel or semivowel ); for GR, without an A, is just as much a Syllable as GRA, with an A.
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