asperating

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]

         The asperated part of its surface.       --Boyle.
   [1913 Webster]