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balloon tire a wide tire with deep walls that is inflated with relatively low air pressure to cushion shocks or facilitate travel on sand.
barrage balloon one of a number of anchored balloons from which wires or nets are suspended to discourage low-flying enemy aircraft from attacking military installations or cities.
hot-air balloon A hot-air balloon is a very large bag that rises high up into the air when it is filled with hot air. This kind of balloon can be attached to something that carries passengers.
pilot balloon a small balloon released to determine wind speed and direction.
trial balloon any tentative action, statement, policy, or program that is released to test public opinion before a final version is put into effect. [2 definitions]