The Collaborative International Dictionary of English v.0.48:

Anfractuosity \An*frac`tu*os"i*ty\, n.; pl. Anfractuosities.
   [Cf. F. anfractuosit['e].]
   1. A state of being anfractuous, or full of windings and
      turnings; sinuosity.
      [1913 Webster]

            The anfractuosities of his intellect and temper.
                                                  --Macaulay.
      [1913 Webster]

   2. (Anat.) A sinuous depression or sulcus like those
      separating the convolutions of the brain.
      [1913 Webster]