any of several astringent substances obtained from various tropical plants, especially from the wood of two East Indian acacias, Acacia catechu and A. suma: used in medicine, dyeing, tanning, etc.
更多catechu例句
Foreign astringents (generally catechu) are added to conceal the presence of exhausted leaves.
A catechu bath is now prepared, in which the silk is entered and worked for an hour, and then allowed to steep over night.
The astringent taste of old brandy is imitated by the introduction of a little catechu into the British spirits.
A third product to which the name catechu is also applied, is obtained from the fruits of the areca or betel palm, Areca catechu.
Ordinary black catechu is usually imported in three different forms.