lighter than air
/ˈlaɪtər ðən ˈɛr/
adjective
- Describing a gas or aircraft that is less dense than the surrounding air, so it floats or rises.
- Lighter-than-air aircraft like zeppelins were popular in the early 20th century.
- Hot air balloons work because heated air is lighter-than-air.
- Helium is a lighter-than-air gas used to fill balloons and blimps.
- Extremely light in weight or feeling; very airy or delicate.
- She wore a lighter-than-air summer dress that floated in the breeze.
- His mood became lighter-than-air after he finished his exams.
- The soufflé was so fluffy it felt lighter-than-air.
Antonyms