*anfractuosity*

n.; pl. Anfractuosities [ Cf. F. anfractuosité. ] 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 ]