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lighter-than-air

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light⋅er-than-air

[lahy-ter-thuhn-air]
–adjective Aeronautics.
1. (of an aircraft) weighing less than the air it displaces, hence obtaining lift from aerostatic buoyancy.
2. of or pertaining to lighter-than-air craft.

Origin:
1900–05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To lighter-than-air
light·er-than-air   (lī'tər-thən-âr')
adj.  Having a weight less than that of the air displaced. Used of certain aircraft.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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