Geometry. A continuous curve traced by a point moving round a fixed point in the same plane while steadily increasing (or diminishing) its distance…

Having the form of a helix; screw-shaped; spiral. Chiefly in Zoology of shells, and in Botany of forms of inflorescence, etc.

Mathematics. In logistic line, logistic spiral = logarithmic. Also = pertaining to a logarithmic curve, e.g. logistic semi-ordinate. logistic curve…