1. Of or related to an amphitheatre
   - amphitheatrical

See also: amphitheater [US]

• obscureness
• obscurity
• obsecrate
• obsequious
• obsequiously
• obsequiousness
• obsequy
• observable
• observably
• observance
• observant
• observantly
• observation
• observation dome
• observation post
• observation station
• observation tower
• observational
• observator
• observatory
• observe
• observed
• observed fire
• observer
• observer's meridian