atavism /atˈə-vi-zm/

1. The reappearance of ancestral, but not parental, characteristics
2. Reversion to an ancestral, or to a primitive, type

atavistˈic adjective

• drill-press
• drill-presses
• drill rig
• drill rigs
• drills
• drill-sergeant
• drill-sergeants
• drillship
• drillships
• drill string
• drill strings
• drily
• D-ring
• drink
• drinkable
• drinkableness
• drinkablenesses
• drink-drive
• drink-driven
• drink-driver
• drink-drivers
• drink-drives
• drink-driving
• drink-drove
• drinker