What does "balloon" mean?

Additional senses

1. 2.(Chem.) A round vessel, usually with a short neck, to hold or receive whatever is distilled; a glass vessel of a spherical form.
2. 3.(Pyrotechnics) A bomb or shell. [Obs.]
3. 4.A game played with a large inf [Obs.]
4. 5.(Engraving) The outline inclosing words represented as coming from the mouth of a pictured figure. Air balloon, a balloon for aërial navigation. -- Balloon frame (Carp.), a house frame constructed altogether of small timber. -- Balloon net, a variety of woven lace in which the weft threads are twisted in a peculiar manner around the warp.
5. 6.To take up in, or as if in, a balloon.
6. 7.To go up or voyage in a balloon.
7. 8.To expand, or puff out, like a balloon.