WordNet (r) 3.0 (2006):

Quercus borealis
    n 1: large symmetrical deciduous tree with rounded crown widely
         distributed in eastern North America; has large leaves with
         triangular spiny tipped lobes and coarse-grained wood less
         durable than that of white oaks [syn: northern red oak,
         Quercus rubra, Quercus borealis]