Adjective dirt has 1 sense
  1. dirt, ungraded - (of roads) not leveled or drained; unsuitable for all year travel
    Antonym: improved (indirect, via unimproved)
,Noun dirt has 4 senses
  1. soil, dirt - the part of the earth's surface consisting of humus and disintegrated rock
    --1 is a kind of earth, ground
    --1 has particulars:
     marl; regosol; residual soil, residual clay; topsoil, surface soil; subsoil, undersoil; alluvial soil; bog soil; clay; clunch; desert soil, desertic soil; caliche, hardpan; fuller's earth; gilgai soil; gumbo, gumbo soil; humus; indurated clay; Indian red; laterite; loam; loess; mold, mould; mud, clay; bole; podzol, podzol soil, podsol, podsol soil, podsolic soil; prairie soil; sand; sedimentary clay; silt; till, boulder clay; tundra soil; wiesenboden
  2. dirt, filth, grime, soil, stain, grease, grunge - the state of being covered with unclean things
    --2 is a kind of dirtiness, uncleanness
  3. crap, dirt, shit, shite, poop, turd - obscene terms for feces
    --3 is a kind of fecal matter, faecal matter, feces, faeces, BM, stool, ordure, dejection
  4. scandal, dirt, malicious gossip - disgraceful gossip about the private lives of other people
    --4 is a kind of gossip, comment, scuttlebutt