ALL meanings of micra
mi·cra
M m - noun micra a plural of micron. 1
- noun plural micra Also called micrometer. the millionth part of a meter. Symbol: μ, mu. 1
- noun plural micra Physical Chemistry. a colloidal particle whose diameter is between 0.2 and 10 microns. 1
- noun plural micra Physics. a very small unit of pressure, equal to that exerted by a column of mercury 1μ high. 1
- abbreviation MICRA micron 0