confocal

[kon-foh-kuhl]

con·fo·cal

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

Origin:
1865–70; con- + focal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Confocal is always a great word to know.
So is real number. Does it mean:
a rational number or the limit of a sequence of rational numbers, as opposed to a complex number
the product obtained by multiplying a quantity by itself one or more times, the exponent of an expression
Collins
World English Dictionary
confocal (kɒnˈfəʊkəl)
 
adj
having a common focus or common foci: confocal ellipses

Collins English Dictionary - Complete & Unabridged 10th Edition
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