Definition of asses' bridge
: 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
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Origin and Etymology of asses' bridge
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
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