Definition: quercus

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Source: WordNet (r) 1.7 

Quercus
     n : oaks [syn: Quercus, genus Quercus]

Source: Webster's Revised Unabridged Dictionary (1913) 

Quercite \Quer"cite\, n. (Chem.)
   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.
Quercitrin \Quer"cit*rin\, n. [Cf. F. quercitrin. See
   Quercitron.] (Chem.)
   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 \Quer"cus\, n. [L., an oak.] (Bot.)
   A genus of trees constituted by the oak. See Oak.