1. Plural of micrometre; units of length equal to one millionth of a metre (10⁻⁶ m), commonly used in microscopy and precision engineering.
Usage: Also spelled 'micrometers' in U.S. English; Often abbreviated as μm or µm

Examples

• The thickness of the cell membrane is approximately 7 micrometres.
• Dust particles smaller than 10 micrometres can penetrate deep into the lungs.
• The precision of the instrument allows measurements down to 0.1 micrometres.
• Red blood cells are roughly 7 to 8 micrometres in diameter.
• The coating was applied in layers of just a few micrometres each.