ultralightweight
adjective
ul·tra·light·weight
ˌəl-trə-ˈlīt-ˌwāt
: 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
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Merriam-Webster unabridged
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