pons asinorum[pänz′ as′i nō′rəm]
- Geom. the fifth proposition of the first book of Euclid (that the base angles of an isosceles triangle are equal)
- any problem hard for beginners
Origin: ModL, lit., bridge of asses
Used by arrangement with John Wiley & Sons, Inc.
Origin: New Latin pōns asinōrum, bridge of fools (nickname of the Fifth Proposition in the Elements of Euclid, due to its difficulty) : Latin pōns, bridge + Latin asinōrum, genitive pl. of asinus, ass, fool.