1. relating to or caused by a flood, especially a great flood
Usage: formal; often refers to Noah’s flood

Examples

• The geologist studied diluvian deposits left by ancient floods.
• Diluvian myths appear in many cultures around the world.
• The diluvian sediments revealed evidence of massive water flow.
• Religious scholars debated the diluvian account in Genesis.
• The diluvian theory attempted to explain geological formations through flood action.