1. Common shade tree of eastern and central United States
   - box elder, ash-leaved maple

Type of: maple

Encyclopedia: Acer negundo

• oratrix
• orb
• orb web
• orb-weaver
• orb-weaving
• orb-weaving spider
• orbicular
• orbiculate
• orbiculate leaf
• Orbignya
• Orbignya cohune
• Orbignya martiana
• Orbignya phalerata
• Orbignya spesiosa
• Orbison
• orbit
• orbit period
• orbital
• orbital cavity
• orbital motion
• orbital plane
• orbital point
• orbital rotation
• orbitale
• orbiter