noun (n)

• the remains of something that has been destroyed or broken up(noun.substance)

  Synonym:
  debris, dust, junk, rubble
  

  source: wordnet30
• loose material (stone fragments and silt etc) that is worn away from rocks(noun.substance)

  source: wordnet30
• A mass of substances worn off from solid bodies by attrition, and reduced to small portions; as, diluvial detritus.(noun)

  source: webster1913