stabilizer
noun [ C ]
(UK also stabiliser) uk/ˈsteɪbɪlaɪzər/ us ECONOMICS, FINANCE
something that helps keep an economy, market, etc. stable, so that it does not change unexpectedly:
The behavior of the market is an automatic stabilizer for the economy.
PRODUCTION
something such as a chemical that is added to a substance to prevent it from changing or separating into different parts:
Lead is sometimes added to PVC as an inexpensive stabilizer.