From WordNet (r) 3.0 (2006):
wildcat
adj 1: outside the bounds of legitimate or ethical business
practices; "wildcat currency issued by irresponsible
banks"; "wildcat stock speculation"; "a wildcat airline";
"wildcat life insurance schemes"
2: without official authorization; "an unauthorized strike";
"wildcat work stoppage" [syn: unauthorized, unauthorised,
wildcat]
3: (of a mine or oil well) drilled speculatively in an area not
known to be productive; "drilling there would be strictly a
wildcat operation"; "a wildcat mine"; "wildcat drilling";
"wildcat wells"
n 1: an exploratory oil well drilled in land not known to be an
oil field [syn: wildcat well, wildcat]
2: a cruelly rapacious person [syn: beast, wolf, savage,
brute, wildcat]
3: any small or medium-sized cat resembling the domestic cat and
living in the wild