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pseudosphere

[soo-duh-sfeer]
noun Geometry.
  1. a surface generated by revolving a tractrix about its asymptote.
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Origin of pseudosphere

First recorded in 1885–90; pseudo- + sphere
Related formspseu·do·spher·i·cal [soo-duh-sfer-i-kuh l, -sfeer-] /ˌsu dəˈsfɛr ɪ kəl, -ˈsfɪər-/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018