con·fo·cal

[kon-foh-kuhl]
adjective Mathematics.
having the same focus or foci.

Origin:
1865–70; con- + focal

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
confocal (kɒnˈfəʊkəl) [Click for IPA pronunciation guide]
 
adj
having a common focus or common foci: confocal ellipses

Collins English Dictionary - Complete & Unabridged 10th Edition
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Confocal is always a great word to know.
So is quincunx. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Example sentences
Here an emulsion of tuna oil is stabilized with a fiber called chitosan and imaged using confocal microscopy.
Using laser-scanning confocal microscopy for higher magnifications, the group could discern a helical structure.
For decades, scientists have used a technique called confocal microscopy to look at the distribution of proteins within a cell.
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