Source : Webster's Revised Unabridged Dictionary (1913)

Dirt \Dirt\, n. [OE. drit; kin to Icel. drit excrement, dr[=i]ta
   to dung, OD. drijten to dung, AS. gedr[=i]tan.]
   1. Any foul of filthy substance, as excrement, mud, dust,
      etc.; whatever, adhering to anything, renders it foul or
      unclean; earth; as, a wagonload of dirt.

            Whose waters cast up mire and dirt.   --Is. lvii.
                                                  20.

   2. Meanness; sordidness.

            Honors . . . thrown away upon dirt and infamy.
                                                  --Melmoth.

   3. In placer mining, earth, gravel, etc., before washing.

   {Dirt bed} (Geom.), a layer of clayey earth forming a stratum
      in a geological formation. Dirt beds are common among the
      coal measures.

   {Dirt eating}.
      (a) The use of certain kinds of clay for food, existing
          among some tribes of Indians; geophagism. --Humboldt.
      (b) (Med.) Same as {Chthonophagia}.

   {Dirt pie}, clay or mud molded by children in imitation of
      pastry. --Otway (1684).

   {To eat dirt}, to submit in a meanly humble manner to
      insults; to eat humble pie.

Dirt \Dirt\, v. t.
   To make foul of filthy; to dirty. --Swift.

Source : WordNet®

dirt
     n 1: the part of the earth's surface consisting of humus and
          disintegrated rock [syn: {soil}]
     2: the state of being covered with unclean things [syn: {filth},
         {grime}, {soil}, {stain}, {grease}, {grunge}]
     3: obscene terms for feces [syn: {crap}, {shit}, {shite}, {poop},
         {turd}]
     4: disgraceful gossip about the private lives of other people
        [syn: {scandal}, {malicious gossip}]

dirt
     adj : (of roads) not leveled or drained; unsuitable for all year
           travel [syn: {ungraded}]

Source : Free On-Line Dictionary of Computing

Dirt
     
        {Design In Real Time}