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.