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Children's Dictionary
aircraft any machine that can fly through the air, such as an airplane, helicopter, glider, or balloon.
ballast heavy material placed in the car of a balloon to make it more stable. [1/2 definitions]
balloon to swell like a balloon. [1/3 definitions]
gondola a basket, car, or sling that hangs below a balloon or blimp, used for carrying passengers or instruments. [1/2 definitions]