submicrogram

adjective
sub·​mi·​cro·​gram | \ ˌsəb-ˈmī-krə-ˌgram How to pronounce submicrogram (audio) \

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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