atavism /atˈə-vi-zm/

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

• inside left
• inside lefts
• inside of
• inside out
• insider
• insider dealing
• inside right
• insiders
• insider trading
• insides
• inside track
• inside tracks
• insidious
• insidiously
• insidiousness
• insidiousnesses
• in sight
• insight
• insightful
• insight learning
• insights
• insigne
• insignia
• insignias
• insignificance