- [Bot] A genus of trees of the Olive family, having opposite pinnate leaves, many of the species furnishing valuable timber, as the European ash (Fraxinus excelsior) and the white ash (Fraxinus Americana).
- The tough, elastic wood of the ash tree.
Note: Ash is used adjectively, or as the first part of a compound term; as, ash bud, ash wood, ash tree, etc.
Etymology: OE. asch esh, AS. æsc; akin to OHG. asc, Sw. & Dan. ask, Icel. askr, D. esch, G. esche