Pronunciation: (sûr"kum-vu-lOO'shun),[key] —n. 1. the act of rolling or turning around: planetary circumvolution. 2. a single complete turn or cycle.
3. a winding or folding about something: the circumvolutions of a boa. 4. a fold so wound: the circumvolution of a snail shell. 5. a winding in a sinuous course; a sinuosity: the circumvolutions of the river. 6. a roundabout course or procedure, or an instance of such: The speaker's circumvolutions bored the audience to tears.