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asphalt a sticky brown to black bituminous substance, occurring naturally or obtained as a by-product of refining petroleum and coal tar, and used for paving, roofing, and waterproofing. [1/4 definitions]
molasses a thick dark brown syrup produced from sorghum or as a by-product when sugar is refined.
strontium a highly reactive chemical element of the alkaline-earth group that has thirty-eight protons in each nucleus, that occurs naturally only in compounds, and that has highly toxic radioactive isotopes that are by-products of some types of nuclear fission reactions. (symbol: Sr)