Webster's English Dictionary

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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