Balloon

bal-loon',s any spherical hollow body; a large spherical bag of silk. or other light material, which, being filled with hydrogen gas or heated air, rises and floats in the air; a gla receiver, of a spherical form, used in distilling [Chem.]; akind of firework resembling a bomb [Pyr.]; a ball, or globe, on the top of a pillar, cupola, . [Arch.] (Fr.)