1. Yellow-green fern of rocky areas of northern hemisphere
   - limestone fern, northern oak fern

Type of: fern

• orpine
• Orpington
• 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