The Collaborative International Dictionary of English v.0.48:

Perspire \Per*spire"\, v. i. [imp. & p. p. Perspired; p. pr. &
   vb. n. Perspiring.] [L. perspirare to breathe through; per
   + spirare. See Per-, and Spirit.]
   1. (Physiol.) To excrete matter through the skin; esp., to
      excrete fluids through the pores of the skin; to sweat.
      [1913 Webster]

   2. To be evacuated or excreted, or to exude, through the
      pores of the skin; as, a fluid perspires.
      [1913 Webster]