Ash is what's left after something has been burned by a fire. You need to clean the ash out of a wood stove or fireplace every once in a while.

After you burn wood in a fire pit or in a bonfire on the beach, there's ash left behind. Cigarette or cigar ash is what smokers tap off the end every so often — the burned part of the cigarette becomes ash. If you use the idiomatic phrase "it turned to ashes in my mouth," you mean that something was a huge disappointment or letdown.

Definitions of ash
  1. noun
    the residue that remains when something is burned
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    fly ash
    fine solid particles of ash that are carried into the air when fuel is combusted
    bone ash
    ash left when bones burn; high in calcium phosphate; used as fertilizer and in bone china
    type of:
    matter that remains after something has been removed
  2. verb
    convert into ashes
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    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
  3. noun
    any of various deciduous pinnate-leaved ornamental or timber trees of the genus Fraxinus
    synonyms: ash tree
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    (Norse mythology) a huge ash tree whose roots and branches hold the earth and Heaven and Hell together
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    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
    European ash, Fraxinus excelsior, common European ash
    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
    Fraxinus nigra, basket ash, black ash, brown ash, hoop ash
    vigorous spreading North American tree having dark brown heavy wood; leaves turn gold in autumn
    Fraxinus ornus, flowering ash, manna ash
    southern Mediterranean ash having fragrant white flowers in dense panicles and yielding manna
    Fraxinus pennsylvanica, downy ash, red ash
    smallish American tree with velvety branchlets and lower leaf surfaces
    Fraxinus quadrangulata, blue ash
    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
    Fraxinus pennsylvanica subintegerrima, green ash
    a variety of red ash having glossy branchlets and lower leaf surfaces
    type of:
    a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms
  4. noun
    strong elastic wood of any of various ash trees; used for furniture and tool handles and sporting goods such as baseball bats
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    type of:
    the hard fibrous lignified substance under the bark of trees
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