From WordNet (r) 3.0 (2006):
cracking
adj 1: very good; "he did a bully job"; "a neat sports car";
"had a great time at the party"; "you look simply
smashing" [syn: bang-up, bully, corking,
cracking, dandy, great, groovy, keen, neat,
nifty, not bad(p), peachy, slap-up, swell,
smashing]
n 1: a sudden sharp noise; "the crack of a whip"; "he heard the
cracking of the ice"; "he can hear the snap of a twig"
[syn: crack, cracking, snap]
2: the act of cracking something [syn: fracture, crack,
cracking]
3: the process whereby heavy molecules of naphtha or petroleum
are broken down into hydrocarbons of lower molecular weight
(especially in the oil-refining process)