adjective Mathematics.
having the same focus or foci.

1865–70; con- + focal Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
confocal (kɒnˈfəʊkəl)
having a common focus or common foci: confocal ellipses

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
For decades, scientists have used a technique called confocal microscopy to look at the distribution of proteins within a cell.
Using laser-scanning confocal microscopy for higher magnifications, the group could discern a helical structure.
Here an emulsion of tuna oil is stabilized with a fiber called chitosan and imaged using confocal microscopy.
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