balloon sail

noun

: a large light sail (such as a spinnaker) set in addition to or in place of an ordinary light sail especially by yachts in moderate weather

Love Words?

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