Micro (Greek letter μ, mu, non- italic) is a unit prefix in the metric system denoting a factor of one millionth (10 −6). [1] It comes from the Greek word μικρός (mikrós), meaning "small".

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The meaning of MICRO is very small; especially : microscopic.

Add to word list very small: a microbrewery (Definition of micro from the Cambridge Academic Content Dictionary © Cambridge University Press)

Micro is a SI unit prefix in the metric system denoting a factor of 10⁻⁶ (one millionth). It is represented by the prefix micro or the symbol µ.

Dec 24, 2025 · From New Latin micro- (“small”), from Ancient Greek μικρός (mikrós, “small”).

Jun 25, 2025 · Meaning of micro, a metric system prefix denoting one-millionth. Discover smaller or larger SI units, micro-related tech terms, and more in this article.

Micro- is used to form nouns that refer to something that is a very small example or fraction of a particular type of thing. These are the cells that directly attack and kill micro-organisms. The pulse is …

Micro- is a combining form used like a prefix meaning “small.” In units of measurement, micro- means "one millionth." The form micro- is often used in a variety of scientific and technical terms. Micro- …

Micro is a unit prefix in the metric system denoting a factor of one millionth (10−6). It comes from the Greek word μικρός, meaning "small".