a. (Zool.) Having spines arranged spirally. See Spicule. [ 1913 Webster ]
‖n. [ NL., dim. of L. spira a coil. ] (Zool.) A genus of cephalopods having a multilocular, internal, siphunculated shell in the form of a flat spiral, the coils of which are not in contact. [ 1913 Webster ]
n. (Zool.) Having the color spots, or structural parts, arranged spirally. [ 1913 Webster ]