Oups I added an extra f : lixiviaction. So it was my phone that change it because it just change it a second tome. It is a french word but I imagine it could also exist in english build the same way. It is the extraction of soluble principale by washing. From latin “lixivius”. To leach. I found a wiktionary page for it : https://en.wiktionary.org/wiki/lixiviate#English