ultrarapid

adjective
ul·​tra·​rap·​id | \ ˌəl-trə-ˈra-pəd How to pronounce ultrarapid (audio) \

Definition of ultrarapid

: marked by an extremely fast rate of motion, activity, succession, or occurrence : extremely or extraordinarily rapid ultrarapid heating/cooling a battery that supports ultrarapid charging

First Known Use of ultrarapid

1921, in the meaning defined above

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The first known use of ultrarapid was in 1921

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