ultralow

adjective
ul·​tra·​low | \ ˌəl-trə-ˈlō How to pronounce ultralow (audio) \

Definition of ultralow

: extremely or extraordinarily low ultralow interest rates vehicles with ultralow emissions Communicating with subs thousands of miles away, under thousands of feet of ocean, requires ultralow frequencies.— Noah Shachtman

First Known Use of ultralow

1849, in the meaning defined above

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The first known use of ultralow was in 1849

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