tannin

noun

tan·​nin ˈta-nən 

1

: any of various soluble astringent complex phenolic substances of plant origin used especially in tanning leather and dyeing textiles, manufacturing ink, clarifying wine and beer, and in medicine

2

: a substance that has a tanning effect

Examples of tannin in a Sentence

Recent Examples on the Web

Still a good price for this quality, the ten years of age brings out more layers of fruit, soft tannins and slight sweetness to the palate. —John Mariani, Forbes, 3 Mar. 2025

However, the tannins in coffee can dye fabrics if left untreated. —Hallie Milstein, Southern Living, 2 Mar. 2025

Ten years in oak means there is a decent amount of oak and tannin, along with some leather, dark chocolate, and wet tobacco notes. —Jonah Flicker, Robb Report, 26 Feb. 2025

This blend of Auxerrois, Pinot Blanc, Chasselas, a touch of Gewürztraminer, Pinot Gris, and Riesling has a delicate maceration for just a week, which is enough to add texture and depth without the heavy tannins that could clash with spicy dishes. —Anna Cafolla, Vogue, 14 Feb. 2025

Word History

Etymology

French, from tanner to tan

First Known Use

1802, in the meaning defined at sense 1

Rhymes for tannin

• canon
• fanon
• mannan
• olecranon
• trianon

Kids Definition

tannin

noun

tan·​nin ˈtan-ən 

: any of various substances from plants (as the oak or sumac) used in tanning leather, dyeing fabric and yarn, the making of ink, and in medicine

Medical Definition

tannin

noun

tan·​nin ˈtan-ən 

1

: any of various soluble astringent complex phenolic substances of plant origin used in tanning, dyeing, the making of ink, and in medicine as astringents and formerly in the treatment of burns

2

: a substance that has a tanning effect