submicrogram

adjective
sub·​mi·​cro·​gram | \ˌsəb-ˈmī-krə-ˌgram \

Definition of submicrogram 

: relating to or having a mass of less than one microgram submicrogram quantities of a chemical

First Known Use of submicrogram

1941, in the meaning defined above

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The first known use of submicrogram was in 1941

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