‖Ra‐di″o‐li (rȧ‐dī″ō̍‐lī), n. pl.; sing. Radiolus (–lŭs). [NL., dim. of L. radius radius: cf. L. radiolus a feeble sunbeam.] (Zoöl.) The barbs of the radii of a feather; barbules.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.