astroid /asˈtroid/ (mathematics)

A hypocycloid with four cusps

• hydrogen peroxide
• hydrogens
• hydrogen sulphide
• hydrogeologies
• hydrogeologist
• hydrogeologists
• hydrogeology
• luffing
• luffing crane
• luffing cranes
• luffing-jib crane
• luffs
• Luftwaffe
• lug
• lug-chair
• lug-chairs
• luge
• luged
• lugeing
• lugeings
• luger
• Luger
• lugers
• Lugers
• luges