1.a round raised part that sticks out from a surface, e.g. a stud at the center of a shield
2.a South African intelligence organization during the apartheid era.
3.a decorative knob on a vaulted ceiling at points where the ribs meet
4.in computer games, an opponent who is hard to defeat but must be overcome in order to complete a game level
5.a round swelling on a plant or on the horn of an animal
6.a mass of volcanic rock with a roughly circular cross section and vertical sides
7.somebody who is in charge of others, especially in a work environment
8.the dominant partner in a relationship or the dominant member of a group, who tends to make decisions and give instructions
9.a politician who exerts a controlling influence, e.g. by applying pressure on others to vote in a particular way
10.the person who is in charge of you at work
11.a circular decoration at the centre of something
bossing