1. The cardinal number that is the sum of seven and one
   - eight, 8, VIII, eighter, octad, ogdoad, octonary, octet

Type of: digit, figure

• Orr
• orrery
• orris
• orrisroot
• Orson Welles
• ort
• Ortalis
• ortanique
• Ortega
• Ortega y Gasset
• orthicon
• Orthilia
• ortho-
• orthoboric acid
• orthocenter
• orthocentre
• orthochorea
• orthochromatic
• orthochromatic film
• orthoclase
• orthodontia
• orthodontic
• orthodontic braces
• orthodontic treatment
• orthodontics