ironwood
/ˈaɪənwʊd/noun
1- any of a number of trees that produce very hard timber, in particular（材质坚硬的）铁木, 尤指：
1.1
- a southern African tree of the olive family (Olea laurifolia, family Oleaceae)一种南部非洲的桂叶木犀榄（拉丁名Olea laurifolia, 木犀科）。
1.2
- a North American tree related to the hornbeam (Ostrya virginiana, family Betulaceae)一种北美与鹅耳枥有亲缘关系的美洲铁木（拉丁名Ostrya virginiana, 桦木科）。