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 ;