\Mox"a\, n. [A corruption of Japan. mogusa (pronounced
mongsa), an escharotic made from the plant yomigi: cf. F.
moxa.]
1. (Med.) A soft woolly mass prepared from the young leaves
   of {Artemisia Chinensis}, and used as a cautery by burning
   it on the skin; hence, any substance used in a like
   manner, as cotton impregnated with niter, amadou.
2. (Bot.) A plant from which this substance is obtained, esp.
   {Artemisia Chinensis}, and {A. moxa}.