catechu
Học thuậtThân thiện
Definition
Noun 1. A spiny tree native to East Asia: A tree (Senegalia catechu, formerly Acacia catechu) characterized by bipinnate leaves, yellow flowers, and flat seed pods. It is the source of a dark extract. 2. A dark, astringent extract: A brittle, solid substance obtained by boiling and evaporating the heartwood of the catechu tree. It is used for dyeing, tanning leather, and preserving materials like fishing nets.
Examples of Usage
- The catechu tree is well-adapted to dry, tropical climates.
- Traditional tanners used catechu to color and preserve leather.
- The dark brown dye was derived from catechu.
Advanced Usage
- Botanical Context: In botanical and forestry texts, "catechu" specifically refers to the tree species .
- Historical/Traditional Use: In historical or ethnographic contexts, "catechu" often denotes the extract used in traditional medicine, dyeing, and as an ingredient in betel quid (a chewing mixture common in Asia).
Variants and Related Words
- Cutch: Another common name for the catechu extract, especially in commercial and industrial contexts (e.g., "cutch dye").
- Black catechu: A specific term for the dark extract, distinguishing it from other similar substances.
- Acacia catechu: The former botanical name for the catechu tree.
Synonyms
- For the extract: Cutch, terra japonica (an archaic term).
- For the tree: Khair tree (common name in India).
Notes on Meaning
The meaning of "catechu" is dependent on context. It can refer to the biological source (the tree) or, more commonly, to the commercial product derived from it (the extract). The extract sense is predominant in discussions of dyes, tanning, and historical trade.
Noun
- East Indian spiny tree having twice-pinnate leaves and yellow flowers followed by flat pods; source of black catechu
- extract of the heartwood of Acacia catechu used for dyeing and tanning and preserving fishnets and sails; formerly used medicinally