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Look up dust bunny in Wiktionary, the free dictionary.

Dust bunnies (or dustbunnies) are small clumps of dust that form under furniture and in corners that are not cleaned regularly. They are made of hair, lint, dead skin, dust, and sometimes light rubbish and debris, and are held together by static electricity and felt-like entanglement. They can actually be harmful when they house dust mites or other parasites.

Dust bunnies are harmful to electronics, as they can seriously obstruct air flow through heat sinks, severely raising temperatures and shortening the life of electronic components.