jack timber

noun

: a timber (as a rafter, rib, or studding) that from being intercepted is shorter than the others with which it is used

Word History

Etymology

jack entry 1 (something smaller)

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