TANNIN
tannin, tannic acid
(noun) any of various complex phenolic substances of plant origin; used in tanning and in medicine
Source: WordNet® 3.1
Etymology
Noun
tannin (plural tannins)
(chemistry) Tannic acid or any of its derivatives.
Synonyms
• E181 when used as a food colouring
Source: Wiktionary
Tan"nin, n. Etym: [Cf. F. tannin.] (Chem.)
Definition: Same as Tannic acid, under Tannic.
Source: Webster’s Unabridged Dictionary 1913 Edition
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SPONGE
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