1. an underground cemetery consisting of galleries or passages with recesses for tombs
Usage: often plural

Examples

• The ancient Roman catacombs contain thousands of burial sites.
• Tourists explored the dark passages of the catacombs beneath the city.
• Early Christians were buried in catacombs outside Rome.
• The catacomb walls were decorated with religious symbols.
• Archaeologists discovered new sections of the catacomb system.
• The Paris catacombs hold the remains of over six million people.