from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of numerous trees, such as the hornbeam and the hop hornbeam, that have very hard wood.
- n. The wood of any of these trees.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of a number of tree species known for having a particularly solid wood.
- n. The wood of any ironwood tree.
from the GNU version of the Collaborative International Dictionary of English
- n. A tree unusually hard, strong, or heavy wood.
from The Century Dictionary and Cyclopedia
- n. One of numerous species of peculiarly hard-wooded trees, belonging to many orders and widely distributed.
- n. In Polynesia, Casuarina equisetifolia, a littoral tree with jointed leafless branches and very hard and heavy wood: used by the natives for making spears. See horsetail-tree and agoho.
- n. A large tree of the myrtle family, Metrosideros lucida, yielding a very hard, strong, red wood, which is used for ship-building, spokes, hubs, and cross-ties for railways.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. exceptionally tough or hard wood of any of a number of ironwood trees
- n. medium-sized hop hornbeam of eastern North America
- n. 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 ties
- n. a small slow-growing deciduous tree of northern Iran having a low domed shape
From iron (for its toughness) + wood (Wiktionary)