[1] : The Collaborative International Dictionary of English v.0.48

catechu \cat"echu\, 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.
   1913 webster
see also:
cashoo acacia catechu terra japonica cutch gambier 

[2] : WordNet (r) 2.0

acacia catechu
     n : east indian spiny tree having twice-pinnate leaves and
         yellow flowers followed by flat pods; source of black
         catechu syn: catechu, jerusalem thorn
see also:
catechu jerusalem thorn 

Catechu >> C Words
Catechu, definition of term: Catechu
catechu_pag1.html

Acacia >> A Words
Acacia, definition of term: Acacia
acacia_pag1.html