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plural microns
(physics) The thousandth part of one millimeter; the millionth part of a meter. quotations examples
As one spacecraft lurches and drags through the Earth's uneven gravity field, the second follows 210 km behind, measuring changes in their separation to the nearest micron (a thousandth of a millimetre).
2009, Jonathan Amos, (bbc.co.uk) Satellites weigh California water
(figurative) A very tiny amount. examples
(linguistics) Synonym of breve examples