tannin

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun any of various complex phenolic substances of plant origin; used in tanning and in medicine

From French tannin, from Latin tannum (“oak bark”), from Gaulish *tannos (“oak”). Related to tan. By surface analysis, tann- + -in.

[64] The pod of a shrub (Cæsalpina coriaria); it contains a considerable proportion of tannin and is used for tanning leather. — Commercial Geography: A Book for High Schools, Commercial Courses, and Business Colleges, Jacques W. (Jacques Wardlaw) Redway
As a matter of fact, this operation must have had a good effect upon the animal; for this gum, being very rich in tannin, was certain to brace the tissues and muscles; but the first sensation of it seemed to distress the poor beast, who ran along lifting up his legs in a very comical fashion. — Adventures of a Young Naturalist, Lucien Biart

tannic acid

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