‖Hy′po‐ra″di‐us (?), n.; pl.Hyporadii (#). [Pref. hypo- + radius.] (Zoöl.) One of the barbs of the hypoptilum, or aftershaft of a feather. See Feather.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.