Source : WordNet®

iron oak
     n 1: small deciduous tree of eastern and central United States
          having dark green lyrate pinnatifid leaves and tough
          moisture-resistant wood used especially for fence posts
          [syn: {post oak}, {box white oak}, {brash oak}, {Quercus
          stellata}]
     2: medium-sized evergreen of southwestern United States and
        northwestern Mexico with oblong leathery often spiny-edged
        leaves [syn: {canyon oak}, {canyon live oak}, {maul oak},
        {Quercus chrysolepis}]