black catechu

Từ điển WordNet v3.1 - WordNet Dictionary

noun

extract of the heartwood of Acacia catechu used for dyeing and tanning and preserving fishnets and sails;
formerly used medicinally
• Syn:
catechu
• Hypernyms:
infusion, extract
• Substance Holonyms:
catechu, Jerusalem thorn, Acacia catechu