Wiktionary
preatomic
Prior to the discovery or use of the atomic bom
Usage examples of "preatomic".
Even in the ancient, preatomic times, before space travel, when only fifteen hundred or so were known, and those the largest, mapping had been impossible.
There was a classic story about that, so old that it probably came from preatomic days.
Seemingly they once possessed star travel, but sank back into a preatomic civilization and are only just now beginning to show signs of a scientific renaissance.
A student of preatomic art she had known in college had compared it to a form by Brancusi.