# milliarcsecond

> English word · Noun

## Definitions
1. A unit of angle equal to one thousandth of an arcsecond (used especially in astronomy)

## Etymology
From milli- + arcsecond.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/milliarcsecond