submicron

adjective
sub·​mi·​cron | \ˌsəb-ˈmī-ˌkrän \

Definition of submicron 

1 : being less than a micron in a (specified) measurement and especially in diameter a submicron particle

2 : having or consisting of submicron particles a submicron metal powder

First Known Use of submicron

1916, in the meaning defined at sense 1

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The first known use of submicron was in 1916

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submicron

adjective
sub·​mi·​cron | \-ˈmī-ˌkrän \

Medical Definition of submicron 

1 : being less than a micron in a (specified) measurement and especially in diameter a submicron particle

2 : having or consisting of submicron particles submicron aerosols

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