Aræotics, in pre-modern medicine, were remedies believed to open up the Sweat pores of the skin, rendering them large enough for diseased matter to be carried off by sweat or perspiration. Such treatments were also believed to rarefy the humours, rendering them easy to be carried off by the pores.
To the class of aræotics belonged diaphoretics, sudorifics, etc.
References
Aræotic Wikipedia(Text) CC BY-SA