microbeam

noun
mi·cro·beam | \ ˈmī-krō-ˌbēm \

Definition of microbeam 

: a beam of radiation of small cross section a focused laser microbeam a microbeam of electrons

First Known Use of microbeam

1950, in the meaning defined above

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The first known use of microbeam was in 1950

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microbeam

noun
mi·cro·beam | \ ˈmī-krō-ˌbēm \

Medical Definition of microbeam 

: a beam of radiation of small cross section a laser microbeam

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to deposit or conceal in a hiding place

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