English definition of Quercus

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Definition of quercus

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Quercus (n.) A genus of trees constituted by the oak. See Oak.

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Cerris :: Cerris (n.) A species of oak (Quercus cerris) native in the Orient and southern Europe; -- called also bitter oak and Turkey oak.

Black-jack :: Black-jack (n.) The Quercus nigra, or barren oak..

Kermes :: Kermes (n.) A small European evergreen oak (Quercus coccifera) on which the kermes insect (Coccus ilicis) feeds.

Oak :: Oak (n.) Any tree or shrub of the genus Quercus. The oaks have alternate leaves, often variously lobed, and staminate flowers in catkins. The fruit is a smooth nut, called an acorn, which is more or less inclosed in a scaly involucre called the cup or cupule. There are now recognized about three hundred species, of which nearly fifty occur in the United States, the rest in Europe, Asia, and the other parts of North America, a very few barely reaching the northern parts of South America and Afric

Valonia :: Valonia (n.) The acorn cup of two kinds of oak (Quercus macrolepis, and Q. vallonea) found in Eastern Europe. It contains abundance of tannin, and is much used by tanners and dyers..

Holm :: Holm (n.) A common evergreen oak, of Europe (Quercus Ilex); -- called also ilex, and holly..

Ilex :: Ilex (n.) The holm oak (Quercus Ilex).

Quercite :: Quercite (n.) A white crystalline substance, C6H7(OH)5, found in acorns, the fruit of the oak (Quercus). It has a sweet taste, and is regarded as a pentacid alcohol..

Cork :: Cork (n.) The outer layer of the bark of the cork tree (Quercus Suber), of which stoppers for bottles and casks are made. See Cutose..

Quercitrin :: Quercitrin (n.) A glucoside extracted from the bark of the oak (Quercus) as a bitter citron-yellow crystalline substance, used as a pigment and called quercitron..

Quercus :: Quercus (n.) A genus of trees constituted by the oak. See Oak.

Quercitron :: Quercitron (n.) The yellow inner bark of the Quercus tinctoria, the American black oak, yellow oak, dyer's oak, or quercitron oak, a large forest tree growing from Maine to eastern Texas..