the.com/tannin

means Tannin is a bitter, astringent plant compound found in things like tea, red wine, unripe fruit, and bark, which binds to proteins in your saliva and makes your mouth feel dry and puckered.

from The word comes from 'tan,' via French 'tanin,' rooted in the practice of tanning animal hides using oak bark and other tannin-rich plant matter — the same compounds that toughen leather are what pucker your tongue. The hide-tanning craft is ancient, and the chemical name simply borrowed the trade's word for its key ingredient.