"to turn or cause to roll," 1640s, from Latin circumvolvere "to roll round, revolve," from circum "around, round about" (see circum-) + volvere "to turn around, roll," from PIE root *wel- (3) "to turn, revolve." Related: Circumvolved; circumvolving (which is attested from early 15c.).
circumstantial
circumstantiate
circumvent
circumvention
circumvolution
circumvolve
circus
cire
cirque
cirrhosis
cirro-