preatomic

[ pree-uh-tom-ik ]
/ ˌpri əˈtɒm ɪk /

adjective

of or relating to the period of history preceding the atomic age.

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Origin of preatomic

First recorded in 1910–15; pre- + atomic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020