a. [ Cf. F. spiral. See Spire a winding line. ]
Spiral gear,
Spiral wheel
Spiral gearing,
Spiral operculum,
Spiral shell,
Spiral spring.
n. [ Cf. F. spirale. See Spiral, a. ]
Equiangular spiral,
Spiral of Archimedes,
n. The quality or states of being spiral. [ 1913 Webster ]
adv. In a spiral form, manner, or direction. [ 1913 Webster ]
n. [ Spiral + zooid. So called because they often have a spiral form when contracted. ] (Zool.) One of the special defensive zooids of certain hydroids. They have the form of long, slender tentacles, and bear lasso cells. [ 1913 Webster ]