pons asinorum
- 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
See pons asinorum in American Heritage Dictionary 4
(pŏnzˈ ăsˌə-nôrˈəm, -nōrˈəm)
noun A problem that severely tests the ability of an inexperienced person.