spiral
/ˈspaɪɹəl/ noun, adjective, verb
Forms spirals spiraling spiralling spiraled spiralled
- 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. “The falling leaves spiralled down from the tree.”
- verb (transitive) To cause something to spiral. “You need to learn how to spiral a ball.”
- verb (figuratively, intransitive) To increase continually. “Her debts were spiralling out of control.”
- verb (intransitive) To decline mentally. “She spiralled into a deep depression.”
Synonyms
swirl billow gyrate spire helix volute coil whorl corkscrew coiling helical spiraling voluted whorled turbinate
Etymology
From Middle French spirale, from Medieval Latin spiralis, from Latin spīra, from Ancient Greek σπεῖρα (speîra, “wreath, coil, twist”).
Webster’s 1913
- adjective Winding or circling round a center or pole and gradually receding from it; as, the spiral curve of a watch spring.
- adjective Winding round a cylinder or imaginary axis, and at the same time rising or advancing forward; winding like the thread of a screw; helical.
- noun A plane curve, not reëntrant, described by a point, called the generatrix, moving along a straight line according to a mathematical law, while the line is revolving about a fixed point called the pole.
- noun Anything which has a spiral form, as a spiral shell. Equiangular spiral,a plane curve which cuts all its generatrices at the same angle. Same as Logarithmic spiral, under Logarithmic.
Etymology [Cf. F. spiral. See Spire a winding line.]
Etymology [Cf. F. spirale. See Spiral, a.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “spiral”, CC BY-SA 4.0. Details