perspirev. i.[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.()v. t. To emit or evacuate through the pores of the skin; to sweat; to excrete through pores.()Firs . . . perspire a fine balsam of turpentine. (Smollett.)