balloon

/bəˈlun/ n [C]

Definition

› a small, thin, rubber bag that you can fill with air or another gas until it is round in shape, often used for decoration at parties or as a child’s toy › A balloon is also a very large, round container filled with a gas that can rise in the air and carry people riding under it in an attached box.

(Definition of balloon n from the Cambridge Academic Content Dictionary © Cambridge University Press)