Radioli (r&adot_;dī&ouptack_;lī), n. pl.; sing. Radiolus (r&adot_;dī&ouptack_;lŭs). [NL., dim. of L. radius radius: cf. L. radiolus a feeble sunbeam.] (Zoöl.) The barbs of the radii of a feather; barbules.
[1913 Webster]