alder
/ˈɔːldə(r)/(亦作alder tree)
noun
1- a widely distributed tree of the birch family, which has toothed leaves and bears male catkins and woody female cones桤木, 赤杨。
1.1
- Genus Alnus, family Betulaceae: many species, especially the common (or European) alder (A. glutinosa), common in damp ground and on riverbanks.桤属, 桦木科：多种, 尤指普通（或欧洲）桤木（拉丁名 A. glutinosa）, 通常长在湿地和河岸。
词源
Old English alor, aler, of Germanic origin; related to German Erle; forms spelled with d are recorded from the 14th cent.