Minor syllable is a term used primarily in the description of Mon-Khmer languages, where a word typically consists of a reduced (minor) syllable followed by a full tonic or stressed syllable. The minor syllable may be of the form /Cə/ or /CəN/, with a reduced vowel, as in colloquial Khmer, or of the form /CC/ with no vowel at all, as in Mlabri /kn̩diːŋ/ "navel" (minor syllable /kn̩/) and /br̩poːŋ/ "underneath" (minor syllable /br̩/). This iambic pattern is sometimes called sesquisyllabic (lit. 'one and a half syllables'), a term coined by the American linguist James Matisoff in 1973. Outside Mon-Khmer, minor syllables are found in Burmese, where in contrast to full syllables they have the form /Cə/, with no consonant clusters allowed in the syllable onset, no syllable coda, and no tone. Recent reconstructions of Proto-Tai and Old Chinese also include sesquisyllabic roots with minor syllables, as transitional forms between fully disyllabic words and the monosyllabic words found in modern Tai languages and modern Chinese.