Decomposition of a complex substance by the application of steam, a catalyst, or heat, especially the breaking of petroleum molecules into shorter molecules to extract low-boiling fractions such as gasoline. (Chemistry) the process in which molecules are cracked, esp the oil-refining process in which heavy oils are broken down into hydrocarbons of lower molecular weight by heat or catalysis. See also catalytic cracker cracking (krk )n. noise - sound of any kind (especially unintelligible or dissonant sound); he enjoyed the street noises; they heard indistinct noises of people talking; during the firework display that ended the gala the noise reached 98 decibels 2. cracking - the act of cracking somethingbreaking, breakage, break - the act of breaking something; the breakage was unavoidable 3. cracking - the process whereby heavy molecules of naphtha or petroleum are broken down into hydrocarbons of lower molecular weight (especially in the oil-refining process)hydrocracking - the...
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