n a tight-fitting headdress
n a top (as for a bottle)
n a mechanical or electrical explosive device or a small amount of explosive; can be used to initiate the reaction of a disrupting explosive
n something serving as a cover or protection
n a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom
n a protective covering that is part of a plant
n an upper limit on what is allowed
n (dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth
n the upper part of a column that supports the entablature
v lie at the top of
v restrict the number or amount of
abbr. 盒式磁带程序设计系统（Cassette Programming System）；计算机辅助产品检索（Computer Assisted Product Search）