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 or equipment through the air.

(medicine) 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.

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

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

(pyrotechnics) A bomb or shell.

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

(slang) A woman's breast.

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

(finance) Synonym of balloon payment.

(intransitive) To increase or expand rapidly.

(intransitive) To go up or voyage in a balloon.

(transitive) To take up in, or as if in, a balloon.

(transitive) To inflate like a balloon.

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

(aviation) Of an aircraft: to plunge alternately up and down.