1. A common rock-inhabiting fern of northern temperate regions having rusty-brown stipes and lanceolate pinnate fronds
   - rusty woodsia, fragrant woodsia, oblong woodsia

Type of: woodsia

• optimistic
• optimistically
• optimization
• optimize
• optimum
• option
• optional
• optionally
• optometrist
• optometry
• opulence
• opulent
• opulently
• Opuntia
• Opuntia cholla
• Opuntia lindheimeri
• Opuntia tuna
• Opuntiales
• opus
• opuscule
• opusculum
• OPV
• opéra bouffe
• or
• OR circuit