The Collaborative International Dictionary of English v.0.48:

Musquash \Mus"quash\, n. [American Indian name.] (Zool.)
   See Muskrat.
   [1913 Webster]

   Musquash root (Bot.), an umbelliferous plant (Cicuta
      maculata), having a poisonous root. See Water hemlock.
      [1913 Webster]