| Answer | Crossword Clue |
|---|---|
| ATAVIST | One marked by reversion to primitive type. |
| ATAVISM | Reversion to primitive type. |
| ATAVISM | Reversion to more primitive type. |
| ATAVISM | Reversion to a more primitive type. |
| atavic | of, pertaining to, or characterized by atavism; reverting to or suggesting the characteristics of a remote ancestor or primitive type |
| vulcanian | Relating to or denoting a type of volcanic eruption marked by periodic explosive events |
