Meaning of prenuclear

pre•nu•cle•ar

Pronunciation: (prē-n'klē-ur, -ny'- or, by metathesis, -kyu-lur), [key]
— adj.
  1. of or pertaining to the era before the development of nuclear weapons.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.