The Collaborative International Dictionary of English v.0.48:

Dirt \Dirt\ (d[~e]rt), n. [OE. drit; kin to Icel. drit
   excrement, dr[imac]ta to dung, OD. drijten to dung, AS.
   gedr[imac]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.
      [1913 Webster]

            Whose waters cast up mire and dirt.   --Is. lvii.
                                                  20.
      [1913 Webster]

   2. Meanness; sordidness.
      [1913 Webster]

            Honors . . . thrown away upon dirt and infamy.
                                                  --Melmoth.
      [1913 Webster]

   3. In placer mining, earth, gravel, etc., before washing.
      [1913 Webster]

   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.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dirt \Dirt\, v. t.
   To make foul of filthy; to dirty. --Swift.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dirt
    adj 1: (of roads) not leveled or drained; unsuitable for all
           year travel [syn: dirt, ungraded]
    n 1: the part of the earth's surface consisting of humus and
         disintegrated rock [syn: soil, dirt]
    2: the state of being covered with unclean things [syn: dirt,
       filth, grime, soil, stain, grease, grunge]
    3: obscene terms for feces [syn: crap, dirt, shit,
       shite, poop, turd]
    4: disgraceful gossip about the private lives of other people
       [syn: scandal, dirt, malicious gossip]

Moby Thesaurus II by Grady Ward, 1.0:

112 Moby Thesaurus words for "dirt":
   Rabelaisianism, X-rated movie, acres, alluvion, alluvium,
   arable land, bawdiness, bawdry, blue movie,
   character assassination, clay, clod, corruption, crust, dirtiness,
   dirty movie, dope, dross, dry land, dust, earth, erotic art,
   erotic literature, erotographomania, excrement, fescenninity,
   filth, filthiness, foulness, freehold, garbage, glebe, gossip,
   gossip column, grassland, grime, ground, iconolagny, indecency,
   inside information, juicy morsel, junk, land, landholdings,
   leavings, lewdness, lithosphere, loam, low-down, malicious gossip,
   marginal land, marl, mire, mold, muck, mud, nastiness, obscenity,
   offal, offensiveness, ooze, ordure, orts, pornographic art,
   pornographic literature, pornographomania, pornography,
   real estate, real property, refuse, region, regolith, ribaldry,
   rubbish, rumor, salaciousness, salacity, scandal, scandalmongering,
   scrap, scurrility, scuttlebutt, sexploitation, sharp practice,
   skin flick, slander, slime, slop, sludge, smut, smuttiness, sod,
   soft-core pornography, soil, soot, stag film, subaerial deposit,
   subsoil, sweepings, talk, terra, terra firma, terrain, territory,
   the country, tidbit, topsoil, trash, vileness, waste,
   whispering campaign, woodland



The Free On-line Dictionary of Computing (30 December 2018):

Design In Real Time
Dirt

    (Dirt) A user interface builder for the X
   Window System by R. Hesketh.

   (1994-12-07)