All 4 Uses

atom
in
Captain Underpants and the Attack of the Talking Toilets
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PATSY is an acronym for Photo-Atomic TransSomgobulating Yectofantriplutoniczanziptomiser.†
p. 29.8

atomic = related to the smallest part of any material that cannot be broken up by chemical means
The Photo-Atomic Trans-Somgobulating Yectofantriplutoniczanziptomiser really DOES create living, breathing, threedimensional copies of one-dimensional images!†
p. 60.6
"And give him turbo-atomic rocket boosters," said George.†
p. 107.6
Lightning bolts zapped, thunder clapped, and the whole gymnasium shook with Photo-Atomic Trans-Somgobulatory Yectofantriplutoniczanziptic energy.†
p. 109.7 *

Definitions:

(1) (atom)
the smallest part of any material that cannot be broken up by chemical means; comprised of a nucleus of protons and neutrons surrounded by orbiting electrons
(2) (meaning too rare to warrant focus)