pons asinorum
Definition from Wiktionary, the free dictionary
Latin[edit]
Noun[edit]
 "The Bridge of Asses": the geometric theorem (Euclid's fifth) that the two angles opposite the equal sides of an isosceles triangle are also equal.
 A difficult early test that must be passed if further progress is to be made.
Translations[edit]
Euclid's fifth theorem

difficult early test
