‖n. pl.; sing. Radiolus /sing>. [ NL., dim. of L. radius radius: cf. L. radiolus a feeble sunbeam. ] (Zool.) The barbs of the radii of a feather; barbules. [ 1913 Webster ]
n. [ L. radius ray + -lite: cf. F. radiolithe. ] (Paleon.) A hippurite. [ 1913 Webster ]