micro

1 of 2

adjective

mi·​cro ˈmī-(ˌ)krō How to pronounce micro (audio)
1
: very small
especially : microscopic
2
: involving minute quantities or variations

micro

2 of 2

noun

plural micros

Examples of micro in a Sentence

Recent Examples on the Web
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Adjective
One micro trend was the addition of jewels and sparkle, seen on Swarovski and Kendra Scott eyewear. Thomas Waller, Footwear News, 10 Oct. 2025 Best Prime Day micro bag deals Micro bags are just the right size for your phone, keys, and lip gloss. Malia Griggs, Glamour, 8 Oct. 2025
Noun
The micro-weave of aramid disperses oils, prevents slipping, and maintains consistent grip over time. New Atlas, 12 Oct. 2025 Macros include carbs, protein, and fat, while micros include vitamins and minerals. Jillian Kubala, Health, 11 Oct. 2025 See All Example Sentences for micro

Word History

Etymology

Adjective

independent use of micro-

Noun

by shortening

First Known Use

Adjective

1923, in the meaning defined at sense 1

Noun

1971, in the meaning defined at sense 1

Time Traveler
The first known use of micro was in 1923

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Cite this Entry

“Micro.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/micro. Accessed 19 Oct. 2025.

Kids Definition

micro

adjective
mi·​cro
ˈmī-krō

Medical Definition

micro

adjective
mi·​cro ˈmī-(ˌ)krō How to pronounce micro (audio)
1
: very small
especially : microscopic
2
involving minute quantities or variations

More from Merriam-Webster on micro

Last Updated: - Updated example sentences
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