1. A red iron ore used in dyeing and marking
   - ruddle, raddle

Derived forms: reddles

Type of: iron ore

• optometrist
• optometry
• opulence
• opulent
• opulently
• Opuntia
• Opuntia cholla
• Opuntia lindheimeri
• Opuntia tuna
• Opuntiales
• opus
• opuscule
• opusculum
• OPV
• opéra bouffe
• or
• OR circuit
• or else
• OR gate
• or so
• ora
• orach
• orache
• oracle
• Oracle of Apollo