The Collaborative International Dictionary of English v.0.48:

Die \Die\, v. i. [imp. & p. p. Died; p. pr. & vb. n. Dying.]
   [OE. deyen, dien, of Scand. origin; cf. Icel. deyja; akin to
   Dan. d["o]e, Sw. d["o], Goth. diwan (cf. Goth. afd?jan to
   harass), OFries. d?ia to kill, OS. doian to die, OHG. touwen,
   OSlav. daviti to choke, Lith. dovyti to torment. Cf. Dead,
   Death.]
   1. To pass from an animate to a lifeless state; to cease to
      live; to suffer a total and irreparable loss of action of
      the vital functions; to become dead; to expire; to perish;
      -- said of animals and vegetables; often with of, by,
      with, from, and rarely for, before the cause or occasion
      of death; as, to die of disease or hardships; to die by
      fire or the sword; to die with horror at the thought.
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            To die by the roadside of grief and hunger.
                                                  --Macaulay.
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            She will die from want of care.       --Tennyson.
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   2. To suffer death; to lose life.
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            In due time Christ died for the ungodly. --Rom. v.
                                                  6.
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   3. To perish in any manner; to cease; to become lost or
      extinct; to be extinguished.
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            Letting the secret die within his own breast.
                                                  --Spectator.
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            Great deeds can not die.              --Tennyson.
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   4. To sink; to faint; to pine; to languish, with weakness,
      discouragement, love, etc.
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            His heart died within, and he became as a stone. --1
                                                  Sam. xxv. 37.
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            The young men acknowledged, in love letters, that
            they died for Rebecca.                --Tatler.
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   5. To become indifferent; to cease to be subject; as, to die
      to pleasure or to sin.
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   6. To recede and grow fainter; to become imperceptible; to
      vanish; -- often with out or away.
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            Blemishes may die away and disappear amidst the
            brightness.                           --Spectator.
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   7. (Arch.) To disappear gradually in another surface, as
      where moldings are lost in a sloped or curved face.
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   8. To become vapid, flat, or spiritless, as liquor.
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   To die in the last ditch, to fight till death; to die
      rather than surrender.
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            "There is one certain way," replied the Prince
            [William of Orange] " by which I can be sure never
            to see my country's ruin, -- I will die in the last
            ditch."                               --Hume (Hist.
                                                  of Eng. ).

   To die out, to cease gradually; as, the prejudice has died
      out.

   Syn: To expire; decease; perish; depart; vanish.
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The Collaborative International Dictionary of English v.0.48:

Dying \Dy"ing\, a.
   1. In the act of dying; destined to death; mortal;
      perishable; as, dying bodies.
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   2. Of or pertaining to dying or death; as, dying bed; dying
      day; dying words; also, simulating a dying state.
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The Collaborative International Dictionary of English v.0.48:

Dying \Dy"ing\, n.
   The act of expiring; passage from life to death; loss of
   life.
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WordNet (r) 3.0 (2006):

dying
    adj 1: in or associated with the process of passing from life or
           ceasing to be; "a dying man"; "his dying wish"; "a dying
           fire"; "a dying civilization" [ant: nascent]
    2: eagerly desirous; "anxious to see the new show at the
       museum"; "dying to hear who won" [syn: anxious(p),
       dying(p)]
    n 1: the time when something ends; "it was the death of all his
         plans"; "a dying of old hopes" [syn: death, dying,
         demise] [ant: birth]