/shwah/ , n. Phonet.
1. the mid-central, neutral vowel sound typically occurring in unstressed syllables in English, however spelled, as the sound of a in alone and sofa, e in system, i in easily, o in gallop, u in circus.
2. the phonetic symbol used to represent this sound.
Also, shwa .
[ 1890-95; shawa, name of a diacritic marking schwa or no vowel ]