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"atomic" is also used as a crossword clue. If that's what you saw, the answer is often nuclear (7 letters).
Definitions
(weapons) deriving destructive energy from the release of atomic energy
Word origin
From atom + -ic.
Used in a sentence
“A stream of atomic hydrogen is emitted.”
“atomic energy; atomic bombs”
“Some nutjob once built a small atomic pile in his back yard.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Related to atoms”6 letters
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