[1] : The Collaborative International Dictionary of English v.0.48

rush \rush\, n. oe. rusche, rische, resche, as. risce, akin to
   lg. rusk, risch, d.  g. rusch; all probably fr. l. ruscum
   butcher's broom; akin to goth. raus reed, g. rohr.
   1. bot. a name given to many aquatic or marsh-growing
      endogenous plants with soft, slender stems, as the species
      of juncus and scirpus.
      1913 webster

   note: some species are used in bottoming chairs and plaiting
         mats, and the pith is used in some places for wicks to
         lamps and rushlights.
         1913 webster

   2. the merest trifle; a straw.
      1913 webster

            john bull's friendship is not worth a rush.
                                                  --arbuthnot.
      1913 webster

   bog rush. see under bog.

   club rush, any rush of the genus scirpus.

   flowering rush. see under flowering.

   nut rush
      a any plant of the genus scleria, rushlike plants with
          hard nutlike fruits.
      b a name for several species of cyperus having
          tuberous roots.

   rush broom, an australian leguminous plant viminaria
      denudata, having long, slender branches. also, the
      spanish broom. see under spanish.

   rush candle, see under candle.

   rush grass, any grass of the genus vilfa, grasses with
      wiry stems and one-flowered spikelets.

   rush toad zool., the natterjack.

   scouring rush. bot. same as dutch rush, under dutch.
      

   spike rush, any rushlike plant of the genus eleocharis,
      in which the flowers grow in dense spikes.

   sweet rush, a sweet-scented grass of arabia, etc.
      andropogon schoenanthus, used in oriental medical
      practice.

   wood rush, any plant of the genus luzula, which differs
      in some technical characters from juncus.
      1913 webster
see also:
juncus scirpus bog rush bog club rush flowering rush 
flowering nut rush scleria cyperus rush broom 
viminaria denudata spanish rush candle candle rush grass 
vilfa rush toad scouring rush dutch rush dutch. 
spike rush eleocharis sweet rush andropogon schoenanthus wood rush 
luzula 

[2] : WordNet (r) 2.0

rush grass
     n : grass having wiry stems and sheathed panicles syn: rush-grass
see also:
rush-grass 

Grass >> G Words
Grass, definition of term: Grass
grass_pag1.html

Grass Roots >> G Words
Grass Roots, definition of term: Grass Roots
grass+roots_pag1.html

Grass Spider >> G Words
Grass Spider, definition of term: Grass Spider
grass+spider_pag1.html

Grass Widow >> G Words
Grass Widow, definition of term: Grass Widow
grass+widow_pag1.html

Grass Widower >> G Words
Grass Widower, definition of term: Grass Widower
grass+widower_pag1.html

Gold Rush >> G Words
Gold Rush, definition of term: Gold Rush
gold+rush_pag1.html

Blue Grass >> B Words
Blue Grass, definition of term: Blue Grass
blue+grass_pag1.html

Blue-Eyed Grass >> B Words
Blue-Eyed Grass, definition of term: Blue-Eyed Grass
blue-eyed+grass_pag1.html

Cotton Grass >> C Words
Cotton Grass, definition of term: Cotton Grass
cotton+grass_pag1.html

Bear Grass >> B Words
Bear Grass, definition of term: Bear Grass
bear+grass_pag1.html