Source : Webster's Revised Unabridged Dictionary (1913)

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.

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