ironwood (Noun) — Handsome East Indian evergreen tree often planted as an ornamental for its fragrant white flowers that yield a perfume; source of very heavy hardwood used for railway ties.
ironwood (Noun) — Exceptionally tough or hard wood of any of a number of ironwood trees.
ironwood (Noun) — A small slow-growing deciduous tree of northern Iran having a low domed shape.
ironwood (Noun) — Medium-sized hop hornbeam of eastern North America.