lighter-than-air

adjective

light·​er-than-air ˈlī-tər-thən-ˈer How to pronounce lighter-than-air (audio)
: of less weight than the air displaced

Word History

First Known Use

1901, in the meaning defined above

Time Traveler
The first known use of lighter-than-air was in 1901

Dictionary Entries Near lighter-than-air

Cite this Entry

“Lighter-than-air.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lighter-than-air. Accessed 29 Nov. 2022.

Kids Definition

lighter-than-air

adjective

: able to fly by the use of a gas (as helium or hot air) less dense than the air that would occupy the same amount of space

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