centrifugal
centrifuge
circle
circular
circulation
cochlear
coil
contort
contortion
convolution
crook
curl
curlicue
curling
curvature
curve
cycle
cyclic
cyclical
devious
eddy
flex
gyrate
gyre
helical
helix
kink
kinky
loop
meander
orbit
revolve
round
spin
spire
surge
swirl
twine
twirl
twist
vertigo
volute
volution
vortex
whirlpool
whirlwind
whorl