Definition of spirals:
(n) :
(geometry) A curve that is the locus of a point that rotates about a fixed point while continuously increasing its distance from that point.
(n) :
(informal) A helix.
(n) :
A self-sustaining process with a lot of momentum involved, so it is difficult to accelerate or stop it at once.
(n) :
(rail transport) A section of track that forms a circle and crosses over itself, used for gaining height in mountainous territory.
(adj) :
Helical, like a spiral.
(v) :
(intransitive) To move along the path of a spiral or helix.