The Collaborative International Dictionary of English v.0.48:

Delibrate \Del"i*brate\, v. t. [imp. & p. p. Delibrated; p.
   pr. & vb. n. Delibrating.] [L. delibratus, p. p. of
   delibrare to delibrate; de from + liber bark.]
   To strip off the bark; to peel. [Obs.] --Ash.
   [1913 Webster]