"catechu" in the noun sense
1. black catechu, catechu
extract of the heartwood of Acacia catechu used for dyeing and tanning and preserving fishnets and sails formerly used medicinally
2. catechu, Jerusalem thorn, Acacia catechu
East Indian spiny tree having twice-pinnate leaves and yellow flowers followed by flat pods source of black catechu
Source: WordNet® (An amazing lexical database of English)
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