red oak noun5 •An oak tree with wood of a red tint, with leaves that have pointed lobes, Quercus rubra, native to eastern North America. •A similar tree of any of the many species in Quercus subg. Quercus, section Lobatae, found mostly in North America. •Wood from such trees. •Agkistrodon contortrix, a venomous snake species found in North America. •(Australia) Carnarvonia araliifolia, a rainforest tree from Australia. formsred oaks