CATECHU Meaning of CATECHU in English [ 'katɪtʃu: ]■ noun a vegetable extract containing tannin, chiefly obtained from an Indian acacia tree and used for tanning and dyeing.OriginC17: mod. L., from Malay kacu . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004