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confocal

American  
[kon-foh-kuhl] / kɒnˈfoʊ kəl /

adjective

Mathematics.
  1. having the same focus or foci.


confocal British  
/ kɒnˈfəʊkəl /

adjective

  1. having a common focus or common foci

    confocal ellipses

"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

Etymology

Origin of confocal

First recorded in 1865–70; con- + focal

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

It is blocking out the light so she can work at a highly-sensitive confocal microscope that uses lasers to illuminate brain samples.

From BBC • Dec. 26, 2025

We also relied on confocal and super-high resolution microscopy in isolated mouse heart muscle cells that were treated with the labeled protein.

From Science Daily • Oct. 13, 2025

Confocal immunofluorescence pictures were taken with a Leica SP5 confocal microscope and 3–5-μm-thick optical sections were collected.

From Nature • Sep. 19, 2017

Back at Harvard as a junior fellow in the mid-1950s, Dr. Minsky invented the confocal scanning microscope that would eventually find many uses in science.

From Washington Post • Jan. 26, 2016

The potential of such a shell at any internal point is constant, and the equipotential surfaces for external space are ellipsoids confocal with the ellipsoidal shell.

From Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" by Various

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