sta ‧ bil ‧ iz ‧ er BrE AmE ( also stabiliser British English ) /ˈsteɪbəlaɪzə, ˈsteɪbɪlaɪzə $ -ər/ noun [countable]
1 . a chemical that helps something such as a food to stay in the same state, for example to prevent it from separating into different liquids
2 . a piece of equipment that helps make something such as a plane or ship steady
3 . [usually plural] British English one of a pair of small wheels that are fastened to the back wheel of a child’s bicycle to prevent it from falling over