onager /onˈə-jər/

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

• surface activity
• surface-craft
• surface-crafts
• surfaced
• surface mail
• surfaceman
• surfacemen
• surface noise
• surface noises
• surface plate
• surface plates
• surfacer
• surfacers
• surfaces
• surface structure
• surface structures
• surface tension
• surface tensions
• surface-to-air
• surface-to-surface
• surface-vessel
• surface-vessels
• surface water
• surface wind
• surface winds