atavism /atˈə-vi-zm/

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

• gumbos
• gum-digger
• gum-diggers
• gum dragon
• gum dragons
• gumdrop
• gumdrops
• gum elastic
• gum elastics
• gum juniper
• gum junipers
• gumma
• gummata
• gummatous
• gummed
• gummier
• gummiest
• gummiferous
• gummily
• gumminess
• gumminesses
• gumming
• gummings
• gummite
• gummites