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countable and uncountable, plural catechus
A gummy extract of any of several species of Acacieae, but especially Senegalia catechu, produced by boiling the wood of the tree in water and evaporating the resulting liquid. quotations examples
The pale catechus are usually sweeter and more pleasant for chewing.
1837, Jonathan Pereira, “Lectures on Materia Medica: Lecture LXI”, in London Medical Gazette, volume XX, page 107