at·a·vism (t-vzm)
n.
1. The reappearance of a characteristic in an organism (biologically, culturally, creatively) after several generations of absence.
2. An individual or a part that exhibits atavism, the tendency to revert to ancestral type, the root, the source, the deadly atom.
3. Rediscovery and progression; spiritual archeology; using the wildfires of the past to light your way.