= balloon, n. 6. Cf. hot-air balloon, n.

A usually round or pear-shaped airtight bag or envelope (originally of paper or silk, now often of synthetic material) designed to rise into the…

A lighter-than-air aircraft; spec. a balloon. In later use chiefly U.S. Now rare.

A balloon filled with gas that is lighter than air; esp. (now frequently historical) one supporting beneath it a basket for passengers. Often…