mixen

from The Collaborative International Dictionary of English v.0.48

Mixen \Mix"en\, n. [AS. mixen, myxen, fr. meohx, meox, dung,
   filth; akin to E. mist. See {Mist}.]
   A compost heap; a dunghill. --Chaucer. Tennyson.
   [1913 Webster]