| n. | 1. | the act of cracking something. |
| 2. | (Chem.) the process of making lower molecular weight hydrocarbons from heavier hydrocarbons in petroleum, by exposure to heat and catalysts. It is used to convert heavier alkanes into gasoline, or to improve the octane number of an alkane mixture. | |
| adj. | 1. | same as groovy, sense 1. |
| Noun | 1. | cracking - a sudden sharp noise; "the crack of a whip"; "he heard the cracking of the ice"; "he can hear the snap of a twig" |
| 2. | cracking - the act of cracking something | |
| 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) | |
| Adj. | 1. | cracking - very good; "he did a bully job"; "a neat sports car"; "had a great time at the party"; "you look simply smashing" |
| cracking - cracker |