The Collaborative International Dictionary of English v.0.48:

Foolery \Fool"er*y\, n.; pl. Fooleries.
   1. The practice of folly; the behavior of a fool; foolish
      behavior; absurdity.
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            Folly in fools bears not so strong a note,
            As foolery in the wise, when wit doth dote. --Shak.
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   2. An act of folly or weakness; a foolish practice; something
      absurd or nonsensical.
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            That Pythagoras, Plato, or Orpheus, believed in any
            of these fooleries, it can not be suspected. --Sir
                                                  W. Raleigh.
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