Канджи оқуының қытай тіліндегі түбірі

Kanji reading based on the original Chinese

, the Sino Japanese reading, is the reading of a kanji based on the Chinese pronunciation of the character. A single kanji might have multiple 'on'yomi' pronunciations reflecting the Chinese pronunciations of different periods or regions. It was often previously referred to as translation reading, as it was recreated readings of the Chinese pronunciation but was not the Chinese pronunciation or reading itself, similar to the English pronunciation of Latin loanwords. Old Japanese scripts often stated that on'yomi readings were also created by the Japanese during their arrival and re borrowed by the Chinese as their own. Some kanji were introduced from different parts of China at different times, and so have multiple on'yomi, and often multiple meanings.

On'yomi primarily occur in multi kanji compound words (熟語), many of which are the result of the adoption, along with the kanji themselves, of Chinese words for concepts that either did not exist in Japanese or could not be articulated as elegantly using native words. This borrowing process is often compared to the English borrowings from Latin, Greek, and Norman French, since Chinese borrowed terms are often more specialized, or considered to sound more erudite or formal, than their native counterparts (occupying a higher linguistic register). The major exception to this rule is family names, in which the native kun'yomi are usually used (though on'yomi are found in many personal names, especially men's names). Kanji invented in Japan (kokuji) would not normally be expected to have on'yomi, but there are exceptions, such as the character "to work", which has the kun'yomi "hatara(ku)" and the on'yomi "dō", and "gland", which has only the on'yomi "sen"—in both cases these come from the on'yomi of the phonetic component, respectively "dō" and "sen".

In Chinese, most characters are associated with a single Chinese sound, though there are distinct literary and colloquial readings. However, some homographs (多音字 ) such as 行 (háng or xíng) (Japanese: an, gō, gyō) have more than one reading in Chinese representing different meanings, which is reflected in the carryover to Japanese as well. Additionally, many Chinese syllables, especially those with an entering tone, did not fit the largely consonant vowel (CV) phonotactics of classical Japanese. Thus most on'yomi are composed of two morae (beats), the second of which is either a lengthening of the vowel in the first mora (to ei, ō, or ū), the vowel i, or one of the syllables ku, ki, tsu, chi, fu (historically, later merged into ō and ū), or moraic n, chosen for their approximation to the final consonants of Middle Chinese. It may be that palatalized consonants before vowels other than i developed in Japanese as a result of Chinese borrowings, as they are virtually unknown in words of native Japanese origin, but are common in Chinese.