activator
/ˈæktɪveɪtər/
noun
- A substance or device that causes something to start working or become active.
- The remote control is the activator for the garage door.
- This enzyme acts as an activator for the digestion of proteins.
- The hair dye comes with an activator that you mix in before applying.
- A person or thing that encourages others to take action or become involved.
- She was the main activator of the school's recycling program.
- The new law became an activator for community protests.
- A good teacher is an activator of curiosity in students.