ovals of Cassini

ovals of Cas·​si·​ni | \-kəˈsēnē, -ka-, -kȧ-\

Definition of ovals of Cassini 

: a curve that is the locus of points of the vertex of a triangle whose opposite side is fixed and the product of whose adjacent sides is a constant and that has the equation [(x + a)2 + y2] [(x − a)2 + y2] − k4 = 0 where k is the constant and a is one half the length of the fixed side

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First Known Use of ovals of Cassini

1837, in the meaning defined above

History and Etymology for ovals of Cassini

after G.D. Cassini †1712 French astronomer

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The first known use of ovals of Cassini was in 1837

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