onager /onˈə-jər/

1. The wild ass of Central Asia
2. An ancient military engine for throwing great stones

• rustlings
• rustproof
• rustproofing
• rustre
• rustred
• rustres
• rust-resistant
• rusts
• rusty
• rusty-back
• rusty-backs
• rusty-coloured
• rusty nail
• rusty nails
• rusé
• rut
• Ruta
• rutabaga
• rutabagas
• Rutaceae
• rutaceous
• ruth
• Ruthene
• Ruthenian
• ruthenic