storage bellows

noun plural but singular or plural in construction

: a chamber in a pipe organ in which the compressed air supplied by the blower is kept at a uniform pressure by means of weights or springs

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