Chemistry,Spectroscopy. a device used to excite radiation by a material in order to determine chemical or elemental composition from the emission spectrum produced.
2.
Surgery. a miniature probe for use in microsurgery.
Main Entry: mi·cro·probe Pronunciation: -"prOb Function: noun : a device for microanalysis that operates by exciting radiation in a minute areaor volume of material so that the composition may be determined from the emission spectrum
[mahy-kruh-prohb] 
krəˌproʊb