Monohydric phenol - Ikka phenol

Japanese: 1価フェノール - いっかふぇのーる
Monohydric phenol - Ikka phenol

...In the narrow sense, phenol refers to the carbolic acid described below.
[Phenols]
Phenols are called monohydric, dihydric, or trihydric phenols depending on the number of hydroxyl groups, and phenols with two or more hydroxyl groups are collectively called polyhydric phenols (or polyphenols). Phenols are found in coal tar and crude petroleum, as well as in plant essential oils (for example, carvacrol, thymol, and catechol).

*Some of the terminology that mentions "monohydric phenol" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…狭義には後述の石炭酸をフェノールという。
【フェノール類】
 水酸基の数により1価フェノール,2価フェノール,3価フェノールのように呼び,2価以上をまとめて多価フェノール(またはポリフェノール)と総称する。フェノール類はコールタール,粗製の石油に含まれるほか,植物精油中にも含まれている(たとえばカルバクロール,チモール,カテコールなど)。…

※「1価フェノール」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

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