Noun has 2 senses

• iron oak(n = noun.plant) box white oak, brash oak, post oak, quercus stellata - 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;


• iron oak(n = noun.plant) canyon live oak, canyon oak, maul oak, quercus chrysolepis - medium-sized evergreen of southwestern United States and northwestern Mexico with oblong leathery often spiny-edged leaves;