friction head

noun

: the head (see head sense 14a) lost by flowing water as a result of friction between the moving water and the walls of its conduit plus intermolecular disturbances

The Ultimate Dicitonary 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