The Collaborative International Dictionary of English v.0.48:

Quoit \Quoit\ (kwoit or koit), n. [OE. coite; cf. OF. coitier to
   spur, press, (assumed) LL. coctare, fr. L. coquere, coctum,
   to cook, burn, vex, harass, E. cook, also W. coete? a quoit.]
   1.
      (a) A flattened ring-shaped piece of iron, to be pitched
          at a fixed object in play; hence, any heavy flat
          missile used for the same purpose, as a stone, piece
          of iron, etc.
      (b) pl. A game played with quoits. --Shak.
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   2. The discus of the ancients. See Discus.
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   3. A cromlech. [Prov. Eng.] --J. Morley.
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The Collaborative International Dictionary of English v.0.48:

Quoit \Quoit\, v. i.
   To throw quoits; to play at quoits.
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         To quoit, to run, and steeds and chariots drive.
                                                  --Dryden.
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The Collaborative International Dictionary of English v.0.48:

Quoit \Quoit\, v. t.
   To throw; to pitch. [Obs. or R.] --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

quoit
    n 1: game equipment consisting of a ring of iron or circle of
         rope used in playing the game of quoits