deb ‧ ris /ˈdebriː, ˈdeɪ- $ dəˈbriː, deɪ-/ BrE AmE noun [uncountable]
[ Date: 1700-1800 ; Language: French ; Origin: débris , from Old French debriser 'to break in pieces' ]
1 . the pieces of something that are left after it has been destroyed in an accident, explosion etc:
She was hit by flying debris from the blast.
2 . technical pieces of waste material, paper etc
plant/garden/industrial etc debris
Clean the ventilation ducts to remove dust and insect debris.