The four hu () are a traditional way of classifying syllable finals of

Mandarin dialects Mandarin (; ) is a group of Chinese (Sinitic) dialects that are natively spoken across most of northern and southwestern China. The group includes the Beijing dialect, the basis of the phonology of Standard Chinese, the official language of ...

, including

Standard Chinese Standard Chinese ()—in linguistics Standard Northern Mandarin or Standard Beijing Mandarin, in common speech simply Mandarin, better qualified as Standard Mandarin, Modern Standard Mandarin or Standard Mandarin Chinese—is a modern Standar ...

, based on different

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s before the central vowel of the final. They are * ''kāikǒu'' (, "open mouth"), finals without a medial * ''qíchǐ'' (, "even teeth"), finals beginning with * ''hékǒu'' (, "closed mouth"), finals beginning with * ''cuōkǒu'' (, "round mouth"), finals beginning with The terms ''kāikǒu'' and ''hékǒu'' come from the Song dynasty

rime tables A rime table or rhyme table () is a Chinese phonological model, tabulating the syllables of the series of rime dictionaries beginning with the '' Qieyun'' (601) by their onsets, rhyme groups, tones and other properties. The method gave a signif ...

describing

Middle Chinese Middle Chinese (formerly known as Ancient Chinese) or the Qieyun system (QYS) is the historical variety of Chinese recorded in the '' Qieyun'', a rime dictionary first published in 601 and followed by several revised and expanded editions. The ...

. The Qing phonologist Pan Lei divided each of these categories in two based on the absence or presence of palatalization, and named the two new categories. pp 128–129. This traditional classification is reflected in the bopomofo notation for the finals, but less directly in the

pinyin Hanyu Pinyin (), often shortened to just pinyin, is the official romanization system for Standard Mandarin Chinese in China, and to some extent, in Singapore and Malaysia. It is often used to teach Mandarin, normally written in Chinese for ...

Notes

References

; Citations ; Works cited * * * {{cite book , given = Yen-Hwei , surname = Lin , title = The Sounds of Chinese , location = Cambridge , publisher = Cambridge University Press , year = 2007 History of the Chinese language Traditional Chinese phonology