catechu
cat.e.chu \'kat-*-.chu:\ n [prob. fr. Malay kachu, of Dravidian origin; akin to Tamil & Kannada k]a-cu catechu : any of several dry, earthy, or resinous astringent substances obtained f rom tropical Asiatic plants : as : an extract of the heartwood of an East Indian acacia (Acacia catechu ) : GAMBIER