self-rescuer

noun

: a pocket-size respirator for emergency use that protects the wearer for a period of about one-half hour against atmospheres containing carbon monoxide gas (as in a contaminated mine)

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