Source : Webster's Revised Unabridged Dictionary (1913)

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}.

   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.

   2. The merest trifle; a straw.

            John Bull's friendship is not worth a rush.
                                                  --Arbuthnot.

   {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} (Zo["o]l.), 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 sch[oe]nanthus}), used in Oriental medical
      practice.

   {Wood rush}, any plant of the genus {Luzula}, which differs
      in some technical characters from {Juncus}.

Rush \Rush\ (r[u^]sh), v. i. [imp. & p. p. {Rushed} (r[u^]sht);
   p. pr. & vb. n. {Rushing}.] [OE. ruschen; cf. AS. hryscan to
   make a noise, D. ruischen to rustle, G. rauschen, MHG.
   r[=u]schen to rush, to rustle, LG. rusken, OSw. ruska, Icel.
   & Sw. ruska to shake, Dan. ruske to shake, and E. rouse.]
   1. To move forward with impetuosity, violence, and tumultuous
      rapidity or haste; as, armies rush to battle; waters rush
      down a precipice.

            Like to an entered tide, they all rush by. --Shak.

   2. To enter into something with undue haste and eagerness, or
      without due deliberation and preparation; as, to rush
      business or speculation.

            They . . . never think it to be a part of religion
            to rush into the office of princes and ministers.
                                                  --Sprat.

Rush \Rush\, v. t.
   1. To push or urge forward with impetuosity or violence; to
      hurry forward.

   2. To recite (a lesson) or pass (an examination) without an
      error. [College Cant, U.S.]

Rush \Rush\, n.
   1. A moving forward with rapidity and force or eagerness; a
      violent motion or course; as, a rush of troops; a rush of
      winds; a rush of water.

            A gentleman of his train spurred up his horse, and,
            with a violent rush, severed him from the duke.
                                                  --Sir H.
                                                  Wotton.

   2. Great activity with pressure; as, a rush of business.
      [Colloq.]

   3. A perfect recitation. [College Cant, U.S.]

   4. (Football)
      (a) A rusher; as, the center rush, whose place is in the
          center of the rush line; the end rush.

Source : WordNet®

rush
     adj 1: not accepting reservations [syn: {first-come-first-serve(p)}]
     2: done under pressure; "a rush job" [syn: {rush(a)}, {rushed}]

rush
     v 1: step on it; "He rushed down the hall to receive his guests";
          "The cars raced down the street" [syn: {hotfoot}, {hasten},
           {hie}, {speed}, {race}, {pelt along}, {rush along}, {cannonball
          along}, {bucket along}, {belt along}] [ant: {linger}]
     2: attack suddenly
     3: urge to an unnatural speed; "Don't rush me, please!" [syn: {hurry}]
        [ant: {delay}]
     4: act or move at high speed; "We have to rush!"; "hurry--it's
        late!" [syn: {hasten}, {hurry}, {look sharp}, {festinate}]
     5: run with the ball, in football
     6: cause to move fast or to rush or race; "The psychologist
        raced the rats through a long maze" [syn: {race}]
     7: cause to occur rapidly; "the infection precipitated a high
        fever and allergic reactions" [syn: {induce}, {stimulate},
         {hasten}]

rush
     n 1: the act of moving hurriedly and in a careless manner; "in
          his haste to leave he forgot his book" [syn: {haste}, {hurry},
           {rushing}]
     2: a sudden forceful flow [syn: {spate}, {surge}, {upsurge}]
     3: grasslike plants growing in wet places and having
        cylindrical often hollow stems
     4: physician and Revolutionary American leader; signer of the
        Declaration of Independence (1745-1813) [syn: {Benjamin
        Rush}]
     5: the swift release of a store of affective force; "they got a
        great bang out of it"; "what a boot!"; "he got a quick
        rush from injecting heroin"; "he does it for kicks" [syn:
        {bang}, {boot}, {charge}, {flush}, {thrill}, {kick}]
     6: a sudden burst of activity; "come back after the rush"
     7: (American football) an attempt to advance the ball by
        running into the line; "the linebackers were ready to stop
        a rush" [syn: {rushing}]

Source : Free On-Line Dictionary of Computing

RUSH
     
        1.  An interactive dialect of {PL/I}, related to
        {CPS}, dated about 1966.  The name is the abbreviation of
        "Remote Use of Shared Hardware".
     
        ["Introduction to RUSH", Allen-Babcock Computing 1969.  Sammet
        1969, p.309.]
     
        2.  A {high-level language} that closely resembles
        {Tcl} but aimed to provide substantially faster execution.
        See {An Introduction to the Rush Language
        (ftp://ginsberg.cs.berkeley.edu/pub/papers/asah/rush-tcl94.ps.gz)}.
        by Adam Sah, Jon Blow, and Brian Dennis (1994).
     
        (1996-12-17)