Catechu
Concise Oxford English Dictionary © 2008 Oxford University Press:
catechu /ˈkatɪtʃuː/
▶noun a vegetable extract containing tannin, chiefly obtained from an Indian acacia tree and used for tanning and dyeing.
– origin C17: mod. L., from Malay kacu.
'Catechu' also found in these Oxford entries:

