Tachibana - Kissei

…Also, in the Shenxian Biography, the Han Dynasty's Duke Su Xian left a will to his mother on his deathbed, saying that the next year would be an epidemic, but that the disease could be cured by using well water from the garden and tachibana leaves from the eaves, and indeed it turned out to be true. From this story came the word tachibana-i, which by extension is also used to refer to doctors. Also, the phrase tachibana will become karatachi if it grows in Huaibei is used as an analogy to show how things change depending on the environment. …

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…また《神仙伝》に漢の蘇仙公が死に臨んで母に遺言し，来年は疫病が流行するが，庭の井戸水と軒端の橘の葉とを用いれば病を治すことができると告げ，果たしてその通りになった。この故事から〈橘井〉の語ができ，転じて医者のことにもいう。また〈橘は淮北に生ずれば枳（からたち）となる〉の語は，環境によって物の変化することをいうたとえに用いる。…

※「橘井」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