n. 儿茶

[医] 儿茶

Catechu \Cat"e*chu\, n. [See {Cashoo}.] (Chem.)
A dry, brown, astringent extract, obtained by decoction and
evaporation from the {Acacia catechu}, and several other
plants growing in India. It contains a large portion of
tannin or tannic acid, and is used in medicine and in the
arts. It is also known by the names {terra japonica},
{cutch}, {gambier}, etc. --Ure. --Dunglison.