not forming a syllable or the nucleus of a syllable; consisting of a consonant sound accompanied in the same syllable by a vowel sound or consisting of a vowel sound dominated by other vowel sounds in a syllable (as the second vowel in a falling diphthong)
[同]
nonsyllabic, unsyllabic
[反]
syllabic
[例]
the nonsyllabic n' in botany' when it is pronounced botny'