astroid /asˈtroid/ (mathematics)

A hypocycloid with four cusps

• Heptameron
• heptamerous
• heptameter
• heptameters
• Heptandria
• heptandrous
• heptane
• heptanes
• heptapodic
• heptapodies
• heptapody
• heptarch
• heptarchic
• heptarchies
• heptarchist
• heptarchists
• heptarchs
• heptarchy
• heptasyllabic
• Heptateuch
• heptateuchal
• heptathlete
• heptathletes
• heptathlon
• heptathlons