[ noun ] a metric unit of length equal to one millionth of a meter

Used in print

(J. F. Vedder, "Micrometeorites", in Francis S. J...)

The solar electromagnetic - and corpuscular-radiation_pressure and the associated Poynting-Robertson effect increase in effectiveness as the particle size decreases and modify the distribution and limit sizes to larger than a_few microns .

(LeRoy Fothergill, "Biological Warfare", in Peter...)

Very small particles , however , in a size range of 1 to 4 microns in diameter are capable of passing these impinging barriers and entering the alveolar_bed of the lungs .

Zinc_cadmium_sulfide in particles of 2 microns in size were disseminated .

A satisfactory cloud was produced even_though these nozzles were only about 5 per_cent efficient in producing an initial cloud in the size range of 1 to 5 microns .