Solid waste, also known as municipal solid waste, is any discarded materials, which could be solid, liquid, and semi-solid or contained gases. Solid waste does not include industrial, hazardous or construction and demolition waste. Examples of solid waste include waste tires, toys, yard scraps, plastics, metals and papers.
http://www.epa.gov/epawaste/nonhaz/municipal/pubs/msw07-fs.pdf