Noun catechu has 2 senses
  1. black catechu, catechu - extract of the heartwood of Acacia catechu used for dying and tanning and preserving fishnets and sails; formerly used medicinally
    --1 is a kind of infusion, extract
    --1 is a substance of catechu, Jerusalem thorn, Acacia catechu
  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
    --2 is a kind of acacia
    --2 is a member of genus Acacia
    --2 has substances: black catechu, catechu
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