Ash n.
 1. 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).
 Prickly ash (Zanthoxylum Americanum) and Poison ash (Rhus venenata) are shrubs of different families, somewhat resembling the true ashes in their foliage.
 Mountain ash. See Roman tree, and under Mountain.
 2. 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.
 Frax·i·nus prop. n.  Bot. A genus of deciduous forest trees, found in the north temperate zone, and including the true ash trees.
 Note: ☞ Fraxinus excelsior is the European ash; Fraxinus Americana, the white ash; Fraxinus sambucifolia, the black ash or water ash.
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 Fraxinus Americana
      n : spreading American ash with leaves pale green or silvery
          beneath and having hard brownish wood [syn: white ash]