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| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| cracking (ˈkrækɪŋ) | |
| —adj | |
| 1. | informal (prenominal) fast; vigorous (esp in the phrase a cracking pace) |
| 2. | informal get cracking to start doing something quickly or do something with increased speed |
| —adv, —adj | |
| 3. | informal (Brit) first-class; excellent: a cracking good match |
| —n | |
| 4. | See also catalytic cracker 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 |
| cracking (krāk'ĭng) Pronunciation Key
The process of breaking down complex chemical compounds by heating them. Sometimes a catalyst is added to lower the amount of heat needed for the reaction. Cracking is used especially for breaking petroleum molecules into shorter molecules and to extract low-boiling fractions, such as gasoline, from petroleum. See also hydrocracking. |
crack definition
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