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preatomic

American

[pree-uh-tom-ik] / ˌpri əˈtɒm ɪk /

adjective

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

Etymology

Origin of preatomic

First recorded in 1910–15; pre- + atomic

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.