The Collaborative International Dictionary of English v.0.48:

Ash \Ash\, n.,
   sing. of Ashes.
   [1913 Webster]

   Note: Ash is rarely used in the singular except in connection
         with chemical or geological products; as, soda ash,
         coal which yields a red ash, etc., or as a qualifying
         or combining word; as, ash bin, ash heap, ash hole, ash
         pan, ash pit, ash-grey, ash-colored, pearlash, potash.
         [1913 Webster]

   Bone ash, burnt powered; bone earth.

   Volcanic ash. See under Ashes.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bone \Bone\ (b[=o]n; 110), n. [OE. bon, ban, AS. b[=a]n; akin to
   Icel. bein, Sw. ben, Dan. & D. been, G. bein bone, leg; cf.
   Icel. beinn straight.]
   1. (Anat.) The hard, calcified tissue of the skeleton of
      vertebrate animals, consisting very largely of calcium
      carbonate, calcium phosphate, and gelatine; as, blood and
      bone.
      [1913 Webster]

   Note: Even in the hardest parts of bone there are many minute
         cavities containing living matter and connected by
         minute canals, some of which connect with larger canals
         through which blood vessels ramify.
         [1913 Webster]

   2. One of the pieces or parts of an animal skeleton; as, a
      rib or a thigh bone; a bone of the arm or leg; also, any
      fragment of bony substance. (pl.) The frame or skeleton of
      the body.
      [1913 Webster]

   3. Anything made of bone, as a bobbin for weaving bone lace.
      [1913 Webster]

   4. pl. Two or four pieces of bone held between the fingers
      and struck together to make a kind of music.
      [1913 Webster]

   5. pl. Dice.
      [1913 Webster]

   6. Whalebone; hence, a piece of whalebone or of steel for a
      corset.
      [1913 Webster]

   7. Fig.: The framework of anything.
      [1913 Webster]

   A bone of contention, a subject of contention or dispute.


   A bone to pick, something to investigate, or to busy one's
      self about; a dispute to be settled (with some one).

   Bone ash, the residue from calcined bones; -- used for
      making cupels, and for cleaning jewelry.

   Bone black (Chem.), the black, carbonaceous substance into
      which bones are converted by calcination in close vessels;
      -- called also animal charcoal. It is used as a
      decolorizing material in filtering sirups, extracts, etc.,
      and as a black pigment. See Ivory black, under Black.


   Bone cave, a cave in which are found bones of extinct or
      recent animals, mingled sometimes with the works and bones
      of man. --Am. Cyc.

   Bone dust, ground or pulverized bones, used as a
      fertilizer.

   Bone earth (Chem.), the earthy residuum after the
      calcination of bone, consisting chiefly of phosphate of
      calcium.

   Bone lace, a lace made of linen thread, so called because
      woven with bobbins of bone.

   Bone oil, an oil obtained by heating bones (as in the
      manufacture of bone black), and remarkable for containing
      the nitrogenous bases, pyridine and quinoline, and their
      derivatives; -- also called Dippel's oil.

   Bone setter. Same as Bonesetter. See in the Vocabulary.


   Bone shark (Zool.), the basking shark.

   Bone spavin. See under Spavin.

   Bone turquoise, fossil bone or tooth of a delicate blue
      color, sometimes used as an imitation of true turquoise.


   Bone whale (Zool.), a right whale.

   To be upon the bones of, to attack. [Obs.]

   To make no bones, to make no scruple; not to hesitate.
      [Low]

   To pick a bone with, to quarrel with, as dogs quarrel over
      a bone; to settle a disagreement. [Colloq.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

bone ash
    n 1: ash left when bones burn; high in calcium phosphate; used
         as fertilizer and in bone china