ultralightweight

adjective
ul·​tra·​light·​weight | \ ˌəl-trə-ˈlīt-ˌwāt How to pronounce ultralightweight (audio) \

Definition of ultralightweight

: having an extremely low weight : very lightweight Exciting new developments in ultralightweight materials and powerful rocket motors now give amateurs all the tools they need to venture toward the final frontier.— Shawn Carlson

First Known Use of ultralightweight

1906, in the meaning defined above

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The first known use of ultralightweight was in 1906

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