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pons as·i·no·rum(pŏnz′ ăs′ə-nôr′əm)
A problem that severely tests the ability of an inexperienced person.
[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.]
(Mathematics) the geometric proposition that the angles opposite the two equal sides of an isosceles triangle are equal
[Latin: bridge of asses, referring originally to the fifth proposition of the first book of Euclid, which was considered difficult for students to learn]