Ygdrasil, Yggdrasil - (Norse mythology) a huge ash tree whose roots and branches hold the earth and heaven and hell together

Fraxinus, genus Fraxinus - ash

ash - strong elastic wood of any of various ash trees; used for furniture and tool handles and sporting goods such as baseball bats

Fraxinus Americana, white ash - spreading American ash with leaves pale green or silvery beneath and having hard brownish wood

Fraxinus caroliniana, swamp ash - small ash of swampy areas of southeastern United States

Fraxinus cuspidata, flowering ash - shrubby ash of southwestern United States having fragrant white flowers

Fraxinus dipetala, flowering ash - shrubby California ash with showy off-white flowers

common European ash, European ash, Fraxinus excelsior - tall ash of Europe to the Caucasus having leaves shiny dark-green above and pale downy beneath

Fraxinus latifolia, Fraxinus oregona, Oregon ash - timber tree of western North America yielding hard light wood; closely related to the red ash

basket ash, black ash, brown ash, Fraxinus nigra, hoop ash - vigorous spreading North American tree having dark brown heavy wood; leaves turn gold in autumn

flowering ash, Fraxinus ornus, manna ash - southern Mediterranean ash having fragrant white flowers in dense panicles and yielding manna

downy ash, Fraxinus pennsylvanica, red ash - smallish American tree with velvety branchlets and lower leaf surfaces

blue ash, Fraxinus quadrangulata - ash of central and southern United States with bluish-green foliage and hard brown wood

Fraxinus texensis, mountain ash - low-growing ash of Texas

Fraxinus tomentosa, pumpkin ash - timber tree of central and southeastern United States having hairy branchlets and a swollen trunk base

Arizona ash, Fraxinus velutina - small shrubby ash of southwestern United States and northwestern Mexico

ash-key - winged seed of the ash tree

tree - a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms