식물의 껍질이나 잎 등에 들어 있는 떫은맛을 내는 유기 화합물로, 가죽 무두질이나 잉크 제조 등에 쓰인다.
A yellowish or brownish bitter-tasting organic substance found in plant tissues, such as bark and galls, used in leather tanning and ink production.
예문:
"The high tannin content in the oak bark makes it ideal for tanning animal hides into leather."
"Red wines often have a dry, astringent quality due to the tannins extracted from the grape skins during fermentation."
"Tannins are natural polyphenols that help protect plants from being eaten by herbivores by making the leaves taste unpleasant."