1. Large dark-blue nonvenomous snake that invades burrows; found in southern North America and Mexico
   - indigo snake, gopher snake

Type of: colubrid, colubrid snake

• backcross
• backdate
• backdoor
• backdown
• backdraft
• backdraught
• backdrop
• backed
• backer
• backfield
• backfile
• backfill
• backfire
• backflow
• backflowing
• backgammon
• backgammon board
• background
• background knowledge
• background level
• background music
• background noise
• background processing
• background radiation
• background signal