(military slang, vulgar) A hat which is gathered and folded on the top.

plural of jimmy cap

(slang) A condom.

(firearms) A dummy round of ammunition used to check ammo feed and other mechanical problems. / A cap or cover that snaps into place.

Alternative spelling of skullcap

The plant miterwort.

plural of rally cap

(US, baseball) A baseball cap worn inside-out and backwards, or in another unconventional manner, by players or fans, as a talisman in order to will a team into a come-from-behind rally late in the game.

plural of filler cap

The cap that closes the opening of a tank, e.g. the fuel tank of a car, through which the tank can be filled.