ultrasmall

adjective
ul·​tra·​small | \ ˌəl-trə-ˈsmȯl How to pronounce ultrasmall (audio) \

Definition of ultrasmall

: extremely or extraordinarily small Ultimately, atoms may serve as building blocks for ultrasmall electronic circuits …— Gene Bylinsky

First Known Use of ultrasmall

1891, in the meaning defined above

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The first known use of ultrasmall was in 1891

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