Winding in a continuous and gradually widening (or tightening) curve, either around a central point on a flat plane or about an axis so as to form a cone
a spiral column of smoke
A spiralling downward path taken by an aircraft that is out of control
(Of a book or notepad) bound with a wire or plastic spiral threaded through a row of holes along one edge
A galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms
A spiral such that the angle between the tangent and the radius vector is the same for all points of the spiral
Another term for equiangular spiral.
Decrease or deteriorate continuously