adjective
- circling around a central point in a flat, two-dimensional curve that constantly increases (or decreases) in size
- circling around a central axis in a conical or cylindrical, three-dimensional curve
Origin:
ML spiralis < L spira, a coil < Gr speira: see spire
intransitive verb spiraled or spiralled, spiraling or spiralling
to move in or form a spiral
transitive verb
to cause to move in or form a spiral