Dictionary entry

ἄτομος

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

** ἄ-τομος, -ον

(< τέμνω), [in Sm.: Is 54:8 (MM, s.v.)*;]

indivisible; of time, ἄτομον, a moment: ἐν ἄ., I Co 15:52.†