Latin quercus "oak," from PIE *kwerkwu-, assimilated form of *perkwu- "oak" (see fir).
Examples from the Web for quercus
Historical Examples of quercus
"I suppose he is telling them that it is some kind of a 'Quercus,'" said Agamemnon, thoughtfully.The Peterkin Papers
Lucretia P Hale
Excrescences on Quercus infectoria caused by the puncture and deposited ova of Diplolepis Gall tinctori.
With Druidism departed the forests of the ilex and the quercus from Aran.The South Isles of Aran
Oliver J. Burke
The Oak (Quercus robur, &c.) is pre-eminently a British tree.Miscellanea
Juliana Horatia Ewing
The cork oak, Quercus suber, grows either singly among other trees or in groups, principally in the southern parts of the island.Itinerary through Corsica
Charles Bertram Black