'iron oak' definitions:

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, iron oak, Quercus stellata]

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, iron oak, Quercus chrysolepis]