• WordNet 3.6
    • n catechin a tannic acid that is extracted from black catechu as a white crystalline substance
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Webster's Revised Unabridged Dictionary
    • n Catechin (Chem) One of the tannic acids (C15H14O6), extracted from catechu as a white, crystalline substance; -- called also catechuic acid catechinic acid cyanidol, and catechuin. It is a flavonoid found generally in higher woody plants, and is used in dyeing and tanning.
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Century Dictionary and Cyclopedia
    • n catechin A principle (C19H18O8) extracted from catechu, having a snow-white silky appearance, and crystallizing in fine needles. Also called catechuic acid and catechuin.
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In literature:

The leguminosae are conspicuous as furnishing us with important dyes, e.g., indigo, logwood, catechin.
"Scientific American Supplement, No. 623, December 10, 1887" by Various
Diamine Catechine B, 4-3/4 oz.
"The Dyeing of Woollen Fabrics" by Franklin Beech
Diamine catechine G, 3 lb.
"The Dyeing of Cotton Fabrics" by Franklin Beech
The catechins are white crystalline substances, apparently isomers with the general formula C{15}H{14}O{6}.
"Animal Proteins" by Hugh Garner Bennett

In news:

Designed for women trying to lead healthier lifestyles, No-Calorie Coca-Cola Plus Catechin is providing a "plus" to Japanese consumers.
Features include a triple filtration system containing Catechin, an additive abstracted from natural green tea.
Tea Forté's skin-smart teas are packed with polyphenols and catechins, which aid in skin recovery.
The trials tested either green tea itself or capsules containing green-tea compounds called catechins, which are thought to decrease cholesterol absorption in the gut.
The Health Benefits of Green Tea Catechins.
The researchers found that spraying toxic catechin on plants or adding it to soil was as effective against some weeds as common synthetic herbicides , typically killing the plants within a week.
Vivanco said no one previously knew about catechin's toxic effect on plants.
Green, black and oolong teas (a traditional Chinese tea somewhere between green and black in oxidation), also contain a powerful antioxidant called catechin.