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.
A strap or rope attached to a bridle or bit, used to control a horse, animal or young child.
The inward impulses; the affections and passions, formerly supposed to be located in the area of the kidneys.
An instrument or means of curbing, restraining, or governing.
To restrain; to control; to check.
To obey directions given with the reins.
To direct or stop a horse by using reins.