Obaku Touon

...the sounds (on) indicated by individual Chinese characters. In languages ​​other than Chinese, it refers to sounds that have been borrowed from Chinese characters and adapted to the language, and is also called "kanji sounds". When borrowing from Chinese, the sounds are modified to fit the phonological system and syllabic structure of each language. In this way, the sounds that have been adapted and established in each language, and the collection and system of sounds that they make up, are called by the name of the language, such as "Japanese kanji sounds", "Korean kanji sounds", and "Vietnamese kanji sounds". Kanji sounds are different from simple loanwords (foreign words) in that they are paired with Chinese characters. ...

*Some of the terminology explanations that refer to "Obaku Touon" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…個々の漢字の示す音（オン）。中国語以外の言語では，中国語の字音をその漢字と共に借用して自らの言語に順応させた音をいい，特に〈漢字音〉とも称する。中国語からの借用に当たっては，字音は個々の言語の音韻体系，音節構造に適合するように変形される。このようにして，言語ごとに順応･定着した字音，その字音の成す集合･体系を〈日本漢字音〉〈朝鮮漢字音〉〈ベトナム(越南)漢字音〉のように，言語名を冠して呼ぶ。　漢字音は，漢字という文字と組になっている点で，単なる借用語(外来語)とは異なる。…

※「黄檗唐音」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報