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]

The Free On-line Dictionary of Computing (19 January 2023):

Design In Real Time
Dirt

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

   (1994-12-07)