Source : Webster's Revised Unabridged Dictionary (1913)

Asperate \As"per*ate\, v. t. [imp. & p. p. {Asperated}; p. pr. &
   vb. n. {Asperating}.] [L. asperatus, p. p. of asperare, fr.
   asper rough.]
   To make rough or uneven.

         The asperated part of its surface.       --Boyle.