The Collaborative International Dictionary
Circumferentially
Circumferentially \Cir*cum`fer*en"tial*ly\, adv. So as to surround or encircle.
Wiktionary
circumferentially
adv. In a way that encircles; around the circumference
Usage examples of "circumferentially".
She was peering at the bends in the corridor, but Miko had vanished tangentially, not circumferentially and was now watching from the peepery.