asses' bridge

noun

: the fifth proposition of the first book of Euclid: the angles at the base of an isoceles triangle are equal to one another

a schoolboy, stammering out his asses' bridge

—Frederic Harrison

Word History

Etymology

translation of New Latin pons asinorum; probably from the similarity of the geometrical construction demonstrating it to the trusses of a bridge and from its being considered a difficulty for poor students of geometry

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