The Collaborative International Dictionary of English v.0.48:

Flix \Flix\, n. [Cf. Flax.]
   Down; fur. [Obs. or Eng.] --J. Dyer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Flix \Flix\, n.
   The flux; dysentery. [Obs.] --Udall.
   [1913 Webster]

   Flix weed (Bot.), the Sisymbrium Sophia, a kind of hedge
      mustard, formerly used as a remedy for dysentery.
      [1913 Webster]