1. relating to or caused by a flood, especially a great flood
Usage: geological; formal
2. relating to or caused by the biblical flood described in Genesis
Usage: biblical; historical

Examples

• The geologist studied diluvial deposits left by ancient floods.
• Diluvial sediments provided evidence of massive water flow in the region.
• The diluvial theory attempted to explain geological formations through flood action.
• Scientists found diluvial gravels scattered across the valley floor.
• The diluvial origin of certain rock formations was debated among researchers.
• Diluvial processes shaped much of the landscape during the ice age.