1. Of timber; having fibers that run in parallel

See also: even

• Orthotomus sutorius
• orthotropic
• orthotropous
• orthotropous ovule
• Ortilis vetula macalli
• ortolan
• ortolan bunting
• ortygan
• Orudis
• Orudis KT
• Orumiyeh
• Oruvail
• Orville Wright
• Orwell
• Orwellian
• Orycteropodidae
• Orycteropus
• Orycteropus afer
• Oryctolagus
• Oryctolagus cuniculus
• oryx
• Oryx gazella
• Oryza
• Oryza sativa
• Oryzomys