débris

from The Century Dictionary.

• Fragments; rubbish; ruins.
• In geol., a mass of rocky fragments irregularly accumulated at any one spot: as, the debris at the base of a cliff: used as both a singular and a plural by French and English writers. See drift, detritus, and screes.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Geol.) Broken and detached fragments, taken collectively; especially, fragments detached from a rock or mountain, and piled up at the base.
• noun Rubbish, especially such as results from the destruction of anything; remains; ruins.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Alternative spelling of debris.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the remains of something that has been destroyed or broken up