split flap

noun

: a hinged flap attached to the upper surface of a wing of an airplane usually at the trailing edge to be raised for lateral control or to the lower surface of a wing to be deflected downward for giving increased lift and drag

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