Having an annular form or shape.
Describes a mushroom with an annulus on the stipe.
Describes a fern sporangium that has an annulus.
One of the Annulata.
Able to be inscribed in a circle.
Firing at its full cyclic rate.
Having chains of atoms arranged in a ring.
Characterized by, or moving in cycles, or happening at regular intervals.
Having parts arranged in a whorl.
Being generated by only one element.
The flight 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.