You searched for: “a wheel”
A unit related to: “a wheel”
troch-, trocho- +
(Greek: that which is round[ed]; a wheel, a disk)
orb-, orbito-
(Latin: rut or track made in the ground by a wheel; circle, ring, round surface, disk)
radio-, radi-, rad-
(Latin: ray, radiating [the Latin word for the spokes of a wheel is radius]; spoke, staff, rod)