n. 1.a tight-fitting headdress 2.a top (as for a bottle) 3.a mechanical or electrical explosive device or a small amount of explosive 4.something serving as a cover or protection 5.a fruiting structure resembling an umbrella that forms the top of a stalked fleshy fungus such as a mushroom 6.an upper limit on what is allowed 7.dental appliance consisting of an artificial crown for a tooth 8.the upper part of a column that supports the entablature cap v. 1.lie at the top of 2.restrict the number or amount of