An inflatable buoyant object, often (but not necessarily) round and flexible.

Such an object as a child’s toy or party decoration.

Such an object designed to transport people through the air.

A sac inserted into part of the body for therapeutic reasons; such as angioplasty.

A speech bubble.

A type of glass cup, sometimes used for brandy.

A ball or globe on the top of a pillar, church, etc.

"the balloon of St. Paul's Cathedral in London"

A round vessel, usually with a short neck, to hold or receive whatever is distilled; a glass vessel of a spherical form.

A bomb or shell.

A game played with a large inflated ball.

(engraving) The outline enclosing words represented as coming from the mouth of a pictured figure.

A woman's breast.

A small container for illicit drugs made from a condom or the finger of a latex glove, etc.

To increase or expand rapidly.

"His stomach ballooned from eating such a large meal."

To go up or voyage in a balloon.

To take up in, or as if in, a balloon.

To inflate like a balloon.

To strike (a ball) so that it flies high in the air.

An unusually large payment due at the end of the term of a loan agreement.