Old woman - Uba

...There were also many cases in which a special, close relationship continued between the wet nurse and the child throughout their life. There is another type of uba, which refers to an old woman, using the characters 'ouba' or 'oba'. The 'ouba' that appears with the 'jo' (the chief priest) in Noh plays is a typical example, but there are many other legends throughout Japan about women called 'ouba'.

*Some of the terminology explanations that mention "Uba (old woman)" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…また乳親と子どもとの間に一生特別の親しい交際がつづく場合もしばしばあった。　ところでウバにはもう一つ，姥とか嫗の字をあてて老女をさすとするものがある。能の前ジテの尉（じよう）とともにあらわれる姥は典型的な姿であるが，このほかにも日本各地に姥と称される女性にまつわる伝説は多い。…

※「姥（嫗）」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