Plural of 'focoid'; multiple points or structures that resemble or function as focal points.
Plural of 'focaloid' formed by adding '-s'. The root '-oid' comes from Greek, making 'focoids' the mathematical plural of focus-like objects.
In mathematics, especially in the study of ellipses, we sometimes discuss multiple 'focoid' points that aren't quite true foci but behave similarly—a way to describe close-cousins of classical geometry.
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