Lighter-than-air Definition

lītər-thən-âr
adjective
Having a weight less than that of the air displaced. Used of certain aircraft.
American Heritage
Designating or of an airship or a balloon designed to be aloft by means of a gas, as hydrogen or helium, that is lighter than air.
Webster's New World

Lighter-than-air Sentence Examples

  • It's incredibly lightweight and very feminine, but chiffon's lighter-than-air qualities don't make it the most durable or strong of materials.

  • It is slightly lighter than air.

  • Hempel pointed out that the efficiency would be increased by inverting this arrangement, since water vapour is lighter than air and consequently rises.

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