| Noun | 1. | ironwood - 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 railroad tiesgenus Mesua, Mesua - genus of tropical Asiatic trees having large solitary flowers tree - a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms | |
| 2. | ironwood - exceptionally tough or hard wood of any of a number of ironwood treeswood - the hard fibrous lignified substance under the bark of trees | |
| 3. | ironwood - a small slow-growing deciduous tree of northern Iran having a low domed shape | |
| 4. | ironwood - medium-sized hop hornbeam of eastern North Americagenus Ostrya, Ostrya - deciduous monoecious trees of Europe and Asia and America; sometimes placed in subfamily or family Carpinaceae hop hornbeam - any of several trees resembling hornbeams with fruiting clusters resembling hops | |