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confocal

[kon-foh-kuh l]
adjective Mathematics.
  1. having the same focus or foci.
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Origin of confocal

First recorded in 1865–70; con- + focal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for confocal

confocal

adjective
  1. having a common focus or common fociconfocal ellipses
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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