phlogisticated air

noun

1

archaic : air exhausted of oxygen by burning a combustible (as charcoal or phosphorus) in it and therefore composed chiefly of nitrogen

2

archaic : hydrogen regarded as inflammable air

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now