atavism /atˈə-vi-zm/

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

• decortications
• decorum
• decorums
• decoupage
• decoupages
• dining-cars
• dining-hall
• dining-halls
• dining room
• dining rooms
• dining table
• dining tables
• din into
• dinitro-
• dinitrobenzene
• dinitrobenzenes
• dinitrogen
• dinitrogen tetroxide
• dink
• dinked
• dinker
• dinkest
• dinkier
• dinkies
• dinkiest