Characterized by, or moving in cycles, or happening at regular intervals.
(ux)
(quote-journal)
Having chains of atoms arranged in a ring.
Having parts arranged in a whorl.
Being generated by only one element.
Able to be inscribed in a circle.
Firing at its full rate.
(quote-book)
The control used to control a helicopter's direction and rate of horizontal movement by tilting the lift vector of the helicopter's main rotor disk.