Noun
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; can be used to initiate the reaction of a disrupting 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;
"they established a cap for prices"7. dental appliance consisting of an artificial crown for a tooth
8. the upper part of a column that supports the entablature