| mountain ash | |
| —n | |
| 1. | any of various trees of the rosaceous genus Sorbus, such as S aucuparia (European mountain ash or rowan), having clusters of small white flowers and bright red berries |
| 2. | any of several Australian eucalyptus trees, such as Eucalyptus regnans |
| a fool or simpleton; ninny. |
| a chattering or flighty, light-headed person. |