# fixed air

> English word · Noun

## Definitions
1. Carbon dioxide; carbonic acid.

## Etymology
Coined by Scottish chemist Joseph Black in 1756 because it can be absorbed, or fixed, by strong bases.

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