Source : Webster's Revised Unabridged Dictionary (1913)

Cerris \Cer"ris\, n. [L. cerrus.] (Bot.)
   A species of oak ({Quercus cerris}) native in the Orient and
   southern Europe; -- called also {bitter oak} and {Turkey
   oak}.

Source : WordNet®

Quercus cerris
     n : large deciduous tree of central and southern Europe and Asia
         Minor having oblong-lanceolate leaves with spiked lobes
         [syn: {European turkey oak}, {turkey oak}]