- (in the distillation of petroleum or the like) the process of breaking down certain hydrocarbons into simpler ones of lower boiling points by means of excess heat, distillation under pressure, etc., in order to give a greater yield of low-boiling products than could be obtained by simple distillation.
- extremely; unusually: We saw a cracking good match at the stadium.
- done with precision; smart: A cracking salute from the honor guard.
- fast; vigorous (esp in the phrase a cracking pace)
- to start doing something quickly or do something with increased speed
- first-class; excellent
- 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
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