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Definition 2025

micro-

micro-

See also: micro and Micro

Translingual

Etymology

New Latin micro- ‎(“small”) (from Ancient Greek μικρός ‎(mikrós, “small”)

Prefix

micro-

  1. Very small.
    organism → microorganism
  2. (metric units) One millionth.
    gram → microgram

Derived terms

<a class='CategoryTreeLabel CategoryTreeLabelNs14 CategoryTreeLabelCategory' href='/wiki/Category:Translingual_words_prefixed_with_micro-'>Translingual words prefixed with micro-</a>

English

Prefix

SI prefix
µ Previous: nano-
Next: milli-

micro-

  1. Very small.
    organism → microorganism
  2. (metric units) One millionth.
    gram → microgram

Usage notes

  • (one millionth): Officially, micro- is abbreviated as µ- (the Greek letter mu); for example, one second is 1s, so one microsecond is 1µs. However, for many purposes this is inconvenient, so writers often use either u- (for its similar appearance to µ-) or mc-, producing, for example, 1um (one micrometer) and 1mcg (one microgram).

Antonyms

Derived terms

<a class='CategoryTreeLabel CategoryTreeLabelNs14 CategoryTreeLabelCategory' href='/wiki/Category:English_words_prefixed_with_micro-'>English words prefixed with micro-</a>

Translations

Catalan

Prefix

micro-

  1. micro-

Antonyms

Derived terms

<a class='CategoryTreeLabel CategoryTreeLabelNs14 CategoryTreeLabelCategory' href='/wiki/Category:Catalan_words_prefixed_with_micro-'>Catalan words prefixed with micro-</a>

Dutch

Pronunciation

Etymology

New Latin micro- ‎(“small”) (from Ancient Greek μικρός ‎(mikrós, “small”)

Prefix

micro-

  1. micro-
<a class='CategoryTreeLabel CategoryTreeLabelNs14 CategoryTreeLabelCategory' href='/wiki/Category:Dutch_words_prefixed_with_micro-'>Dutch words prefixed with micro-</a>

French

Prefix

micro-

  1. micro-

Derived terms

<a class='CategoryTreeLabel CategoryTreeLabelNs14 CategoryTreeLabelCategory' href='/wiki/Category:French_words_prefixed_with_micro-'>French words prefixed with micro-</a>

Italian

Prefix

micro-

  1. micro-

Antonyms

Derived terms

<a class='CategoryTreeLabel CategoryTreeLabelNs14 CategoryTreeLabelCategory' href='/wiki/Category:Italian_words_prefixed_with_micro-'>Italian words prefixed with micro-</a>

Portuguese

Prefix

micro-

  1. micro- (very small)
  2. (metric units) micro- (one millionth)

Spanish

Etymology

From Ancient Greek μικρός ‎(mikrós) "small".

Prefix

micro-

  1. micro-

Antonyms

Derived terms

<a class='CategoryTreeLabel CategoryTreeLabelNs14 CategoryTreeLabelCategory' href='/wiki/Category:Spanish_words_prefixed_with_micro-'>Spanish words prefixed with micro-</a>

Etymology

From Ancient Greek μικρός ‎(mikrós, “small”).

Pronunciation

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