The Collaborative International Dictionary of English v.0.48:

Scoff \Scoff\, v. i. [imp. & p. p. Scoffed (?; 115); p. pr. &
   vb. n. Scoffing.] [Cf. Dan. skuffe to deceive, delude,
   Icel. skopa to scoff, OD. schoppen. See Scoff, n.]
   To show insolent ridicule or mockery; to manifest contempt by
   derisive acts or language; -- often with at.
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         Truth from his lips prevailed with double sway,
         And fools who came to scoff, remained to pray.
                                                  --Goldsmith.
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         God's better gift they scoff at and refuse. --Cowper.
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   Syn: To sneer; mock; gibe; jeer. See Sneer.
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The Collaborative International Dictionary of English v.0.48:

Scoff \Scoff\, v. t.
   To treat or address with derision; to assail scornfully; to
   mock at.
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         To scoff religion is ridiculously proud and immodest.
                                                  --Glanvill.
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The Collaborative International Dictionary of English v.0.48:

Scoff \Scoff\ (?; 115), n. [OE. scof; akin to OFries. schof,
   OHG. scoph, Icel. skaup, and perh. to E. shove.]
   1. Derision; ridicule; mockery; derisive or mocking
      expression of scorn, contempt, or reproach.
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            With scoffs, and scorns, and contumelious taunts.
                                                  --Shak.
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   2. An object of scorn, mockery, or derision.
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            The scoff of withered age and beardless youth.
                                                  --Cowper.
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WordNet (r) 3.0 (2006):

scoff
    n 1: showing your contempt by derision [syn: jeer, jeering,
         mockery, scoff, scoffing]
    v 1: laugh at with contempt and derision; "The crowd jeered at
         the speaker" [syn: jeer, scoff, flout, barrack,
         gibe]
    2: treat with contemptuous disregard; "flout the rules" [syn:
       scoff, flout]