ultramicro

adjective
ul·​tra·​mi·​cro | \ ˌəl-trə-ˈmī-(ˌ)krō How to pronounce ultramicro (audio) \

Definition of ultramicro

: being or dealing with something smaller than micro

First Known Use of ultramicro

1937, in the meaning defined above

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The first known use of ultramicro was in 1937

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