noun
A cat that lives in the wilderness, specifically:
(figurative) A person who acts like a wildcat, (usually) a violent and easily-angered person or a sexually vigorous one.
(American football) An offensive formation with an unbalanced line and a snap directly to the running back rather than the quarterback.
(nautical) A wheel that can be adjusted so as to revolve either with or on the shaft of a capstan.
(firearms) Clipping of wildcat cartridge.
(uncommon) Clipping of wildcat strike (“a strike undertaken without authorization from the relevant trade union”).
(obsolete) Clipping of wildcat money (“notes issued by a wildcat bank”).
adjective
(usually derogatory) Of or concerning businesses operating outside standard or legitimate practice, especially:
(firearms) Of or concerning customized or hand-made cartridges.
Unauthorized by the proper authorities.
verb
(oil industry) To drill for oil in an area where no oil has been found before.