Source : Webster's Revised Unabridged Dictionary (1913)

Slough \Slough\, n. [OE. slogh, slough, AS. sl[=o]h a hollow
   place; cf. MHG. sl[=u]ch an abyss, gullet, G. schlucken to
   swallow; also Gael. & Ir. sloc a pit, pool. ditch, Ir. slug
   to swallow. Gr. ????? to hiccough, to sob.]
   1. A place of deep mud or mire; a hole full of mire.
      --Chaucer.

            He's here stuck in a slough.          --Milton.

   2. [Pronounced sl[=oo].] A wet place; a swale; a side channel
      or inlet from a river.

   Note: [In this sense local or provincial; also spelt {sloo},
         and {slue}.]

   {Slough grass} (Bot.), a name in the Mississippi valley for
      grasses of the genus {Muhlenbergia}; -- called also {drop
      seed}, and {nimble Will}.

Source : WordNet®

slough grass
     n : North American cordgrass having leaves with dry membranous
         margins and glumes with long awns [syn: {prairie
         cordgrass}, {freshwater cordgrass}, {Spartina pectinmata}]