# nonius

> English word · Noun · IPA /ˈnəʊnɪəs/

## Definitions
1. A device for adjusting the accuracy of mathematical instruments, later superseded by the vernier.

## Etymology
Borrowed from Latin Nonius, the Latinised form of the name of its inventor, Pedro Nunes (1502-78), a Portuguese mathematician and geographer.

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