| 释义 |
catechu
cat·e·chu C0160000 (kăt′ə-cho͞o′)n.1. A spiny Asian tree (Acacia catechu) having bipinnately compound leaves, spikes of yellow flowers, and dark heartwood.2. A raw material obtained from the heartwood of this plant, used in the preparation of tannins and brown dyes. In both senses also called cutch.
[Probably from Malay kachu, probably from Dravidian karaiyal, karaiccal, that which is dissolved, from karai, to melt.]catechu (ˈkætɪˌtʃuː) , cachou or cutchn (Elements & Compounds) a water-soluble astringent resinous substance obtained from any of certain tropical plants, esp the leguminous tree Acacia catechu of S Asia, and used in medicine, tanning, and dyeing. See also gambier[C17: probably from Malay kachu, of Dravidian origin]cat•e•chu (ˈkæt ɪˌtʃu, -ˌkyu)
n. any of several astringent substances obtained from various tropical Asian plants, esp. two East Indian acacias, Acacia catechu and A. suma: used in medicine, dyeing, tanning, etc. Also called cutch. [1670–80; < New Latin < Portuguese] Thesaurus| Noun | 1. |  catechu - extract of the heartwood of Acacia catechu used for dyeing and tanning and preserving fishnets and sails; formerly used medicinallyblack catechuAcacia catechu, catechu, Jerusalem thorn - East Indian spiny tree having twice-pinnate leaves and yellow flowers followed by flat pods; source of black catechuextract, infusion - a solution obtained by steeping or soaking a substance (usually in water) | | 2. |  catechu - East Indian spiny tree having twice-pinnate leaves and yellow flowers followed by flat pods; source of black catechuAcacia catechu, Jerusalem thorngenus Acacia - large genus of shrubs and trees and some woody vines of Central and South America, Africa, Australia and Polynesia: wattle; mimosaacacia - any of various spiny trees or shrubs of the genus Acaciablack catechu, catechu - extract of the heartwood of Acacia catechu used for dyeing and tanning and preserving fishnets and sails; formerly used medicinally |
catechu
catechu (kăt`əcho͞o) or cutch, extract from the heartwood of Acacia catechu, a leguminous tree of the pulsepulse,
in botany, common name for members of the Fabaceae (Leguminosae), a large plant family, called also the pea, or legume, family. Numbering about 650 genera and 17,000 species, the family is third largest, after the asters and the orchids.
..... Click the link for more information. family, native to India and Myanmar. Catechu is a fast brown dye used for various shades of brown and olive, including the familiar khaki, and also in tanning. White cutch is a synonym for gambier, a leaf extract of a shrub (Uncaria gambir) of the madder family, which is similarly used.Catechu a substance obtained from the wood of the East Indian acacia (Acacia catechu) of the family Leguminosae (the plant is native to India and Sri Lanka). By boiling small pieces of the wood, an extract is obtained. After evaporation, the extract becomes a thick reddish brown mass. Catechu contains25–55 percent tannin. It dissolves in acetic acid and is precipi-tated from solution by sulfuric acid or gelatin. Catechu is usedto tan hides and, when oxidized by potassium bichromate, it isused as a dye for cotton and silk fabrics. catechu
Related to catechu: black catechuSynonyms for catechunoun extract of the heartwood of Acacia catechu used for dyeing and tanning and preserving fishnets and sailsSynonymsRelated Words- Acacia catechu
- catechu
- Jerusalem thorn
- extract
- infusion
noun East Indian spiny tree having twice-pinnate leaves and yellow flowers followed by flat podsSynonyms- Acacia catechu
- Jerusalem thorn
Related Words- genus Acacia
- acacia
- black catechu
- catechu
|