To roll; turn: as, to circumvolute a period.

To encircle or enwrap: as, circumvoluting twine.

verb. To roll, curl or twist around

verb. wind or turn in volutions, especially in an inward spiral, as of snail

"The old governor, who had purposely been more circumvolute even than usual, in order not too suddenly to shock his feelings, looked up at him with a kind expression, which showed that he truly entered into his wretchedness."

circumvolution  

curve  twist  wind