astroid
noun/ˈæstɹɔɪd/
Etymology From Ancient Greek ἄστρον (ástron, “a star”) + εἶδος (eîdos, “form, likeness”).
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Geometry, Mathematics, Sciences A hypocycloid with four cusps.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.