Definitions of spiral:

• noun:   flying downward in a helical path with a large radius
• noun:   ornament consisting of a curve on a plane that winds around a center with an increasing distance from the center
• noun:   a plane curve traced by a point circling about the center but at ever-greater distances from it
• noun:   a structure consisting of something wound in a continuous series of loops
• noun:   a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle
• verb:   form a spiral

  Example: "The path spirals up the mountain"

• verb:   to wind or move in a spiral course
• verb:   move in a spiral or zigzag course
• adjective:   in the shape of a coil