micro

1 of 3

adjective

mi·​cro ˈmī-(ˌ)krō 

1

: very small

especially : microscopic

2

: involving minute quantities or variations

micro

2 of 3

noun

plural micros

1

: microcomputer

2

: microprocessor

micro-

3 of 3

combining form

see micr-

Examples of micro in a Sentence

Recent Examples on the Web

Adjective

The team looked at the octopus’s internal organs using micro-CT scanning, which collects thousands of x-ray image slices through an object that can then be put together to create a super high-resolution virtual model. —Jeanna Bryner, Scientific American, 24 May 2026

Emphasize a clean, squoval nail with micro French tips. —Kara Jillian Brown, InStyle, 24 May 2026

Minute repeaters straddle the line between the artistry of micro-mechanical watchmaking and the whimsy that is possible in haute horlogerie. —Carol Besler, Forbes.com, 23 May 2026

Tiny micro servos hidden inside the body control the robot’s arms, front hatch, eye movement and head articulation. —Kaif Shaikh, Interesting Engineering, 22 May 2026

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

Phrases Containing micro

• micro-dose
• micro-dosing
• micro-grid
• micro-inverter
• micro-mobility
• micro-RNA

Rhymes for micro

• acknow
• aglow
• ago
• airglow
• aloe
• altho
• although
• ammo
• backflow
• backhoe
• banjo
• barbeau

Kids Definition

micro

adjective

mi·​cro

ˈmī-krō

: microscopic sense 3

Medical Definition

micro

adjective

mi·​cro ˈmī-(ˌ)krō 

1

: very small

especially : microscopic

2

involving minute quantities or variations