The Collaborative International Dictionary of English v.0.48:

Pumicate \Pu"mi*cate\, v. t. [imp. & p. p. Pumicated; p. pr. &
   vb. n. Pumicating.] [L. pumicatus, p. p. of pumicare to
   pumicate, fr. pumex. See Pumice.]
   To make smooth with pumice. [R.]
   [1913 Webster]