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spiral (adj.)

1550s, from French spiral (16c.), from Medieval Latin spiralis "winding around a fixed center, coiling" (mid-13c.), from Latin spira "a coil, fold, twist, spiral," from Greek speira "a winding, a coil, twist, wreath, anything wound or coiled," from PIE *sper-ya-, from base *sper- (2) "to turn, twist." Related: Spirally. Spiral galaxy first attested 1913.

spiral (v.)

1726 (implied in spiraled), transitive, from spiral (n.). Intransitive use by 1834. Transferred and figurative sense by 1922. Related: Spiraling.

spiral (n.)

1650s, from spiral (adj.). U.S. football sense is from 1896. Figurative sense of "progressive movement in one direction" is by 1897. Of books, spiral-bound (adj.) is from 1937.

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Definitions of spiral from WordNet
1
spiral (n.)
a plane curve traced by a point circling about the center but at increasing distances from the center;
spiral (n.)
a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle;
Synonyms: helix
spiral (n.)
a continuously accelerating change in the economy;
spiral (n.)
ornament consisting of a curve on a plane that winds around a center with an increasing distance from the center;
Synonyms: volute
spiral (n.)
a structure consisting of something wound in a continuous series of loops;
Synonyms: coil / volute / whorl / helix
spiral (n.)
flying downward in a helical path with a large radius;
2
spiral (v.)
to wind or move in a spiral course;
Synonyms: gyrate / coil
spiral (v.)
form a spiral;
The path spirals up the mountain
spiral (v.)
move in a spiral or zigzag course;
Synonyms: corkscrew
3
spiral (adj.)
in the shape of a coil;
Synonyms: coiling / helical / spiraling / volute / voluted / whorled / turbinate
From wordnet.princeton.edu