cidaris /sidˈə-ris/

1. A Persian royal tiara
2. (with cap) a genus of sea urchins, mostly fossil

• cuppers
• cupping
• cupping-glass
• cupping-glasses
• cuppings
• cuprammonium
• cuprammonium rayon
• cuprammoniums
• cuprate
• cupreous
• Cupressus
• cupric
• cupriferous
• cuprite
• cuprites
• cupronickel
• cupronickels
• cuprous
• cups
• cup-tie
• cup-tied
• cup-ties
• cupular
• cupulate
• cupule