stabilizer
US /ˈsteɪ.bə.laɪ.zɚ/
UK /ˈsteɪ.bə.laɪ.zɚ/

1.
a device or substance that prevents unwanted changes in something
:
•
The ship was fitted with a new stabilizer to reduce rolling.
•
Food manufacturers often add stabilizers to prevent ingredients from separating.