helium balloon
noun
Roget 320:
levity;
lightness
etc.
adj.;
imponderability,
buoyancy,
volatility.
feather,
dust,
mote,
down,
thistle,
down,
flue,
cobweb,
gossamer,
straw,
cork,
bubble,
balloon;
float,
buoy;
ether,
air.
leaven,
ferment,
barm†,
yeast.
lighter-than-air balloon,
helium balloon,
hydrogen balloon,
hot air balloon.
convection,
thermal draft,
thermal.
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