Something that encourages progress or change.
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).
An inciting incident that sets the successive conflict into motion.
Something that corrects or counteracts.
A medicine, application, or treatment that relieves or cures a disease.
The accepted tolerance or deviation in fineness or weight in the production of gold coins etc.
The legal means to recover a right or to prevent or obtain redress for a wrong.
To provide or serve as a remedy for.