A substance that increases the rate of a chemical reaction without being consumed in the process.
A catalytic converter.
An object that facilitates the casting of a spell (such as a magic wand).
Something that encourages progress or change.
An inciting incident that sets the successive conflict into motion.
To use obstructionist tactics in a legislative body.
To take part in a private military action in a foreign country.
A mercenary soldier; a freebooter; specifically, a mercenary who travelled illegally in an organized group from the United States to a country in Central America or the Spanish West Indies in the mid-19th century seeking economic and political benefits through armed force.
A tactic (such as giving long, often irrelevant speeches) employed to delay the proceedings of, or the making of a decision by, a legislative body, particularly the United States Senate.
A member of a legislative body causing such an obstruction; a filibusterer.