windsail

noun

1

: the sail of a windmill

2

: a wide tube or funnel of canvas used to carry air for ventilation into the lower compartments of a ship

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