Definitions from Wiktionary ( )

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

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