pons asinorum

[ as-uh-nawr-uhm, -nohr- ]
/ ˌæs əˈnɔr əm, -ˈnoʊr- /

noun Geometry.

a geometric proposition that if a triangle has two of its sides equal, the angles opposite these sides are also equal: so named from the difficulty experienced by beginners in mastering it. Euclid, 1:5.



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Also called asses' bridge .

Origin of pons asinorum

First recorded in 1745–55; from Latin pōns asinōrum “bridge of asses”

Words nearby pons asinorum

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for pons asinorum

pons asinorum
/ (ˌæsɪˈnɔːrəm) /


the geometric proposition that the angles opposite the two equal sides of an isosceles triangle are equal

Word Origin for pons asinorum

Latin: bridge of asses, referring originally to the fifth proposition of the first book of Euclid, which was considered difficult for students to learn
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012