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Tetraplyoctomy is the art or skill of splitting a hair four ways. Don’t be a mere two-way hair-splitter; grasp your pedantry firmly in both hands and split your hair crosswise into four.

This word has found a secure if niche existence in the lexicons of academics with a sense of humour since it was invented by Umberto Eco in his novel Foucault’s Pendulum, published in English in 1989. In a mocking attempt to reform higher education, one character proposes a School of Comparative Irrelevance, whose aim would be to turn out scholars capable of endlessly increasing the number of unnecessary topics. In it would be a Department of Tetrapyloctomy, whose function would be to inculcate a sense of irrelevance in its students. Another department would study useless techniques, such as Assyrio-Babylonian philately and Aztec Equitation.

The word combines tetra, four, with pilus, hair (as in depilatory), and the ending -tomy, a cutting. As the component parts come respectively from Greek, Latin and Greek it’s a miscegenated linguistic sandwich that no self-respecting scholar would invent, which is no doubt why Umberto Eco found it to be appropriate.

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Copyright © Michael Quinion, 1996–. All rights reserved.
Page created 5 Jun. 2004

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The English language is forever changing. New words appear; old ones fall out of use or alter their meanings. World Wide Words tries to record at least a part of this shifting wordscape by featuring new words, word histories, words in the news, and the curiosities of native English speech.

World Wide Words is copyright © Michael Quinion, 1996–. All rights reserved.
This page URL: http://www.worldwidewords.org/weirdwords/ww-tet1.htm
Last modified: 5 June 2004.