Either of two major British and European deciduous forest trees of the genus Quercus (family Fagaceae), Q. robur (also called common oak, English oak…

Any tree of the genus Quercus; = oak, n. 1a.

Chiefly poetic. An oak growing in mountainous country. Now rare.

any of various oak trees producing pale wood, (in later use) spec. Quercus alba, of eastern North America and (in full Oregon white oak) Q. garryana…

any of several oaks with particularly durable wood; esp. the post oak, Quercus stellata, of eastern North America.

Any of several kinds of North American oak having hard close-grained durable wood much used for posts, sleepers, etc., esp.: (a) Quercus stellata…

Of or relating to Slavonic countries. In the bird-names Slavonian falcon, Slavonian grebe. Also, Slavonian oak, the silvery timber of a European oak…