hippopede
nounEtymology Borrowed from Ancient Greek ἱπποπέδη (hippopédē, “horse fetter”).
1
A plane curve defined by the equation (x²+y²)²=cx²+dy², where it is assumed that c>0 and c>d.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.