Strong's Concordance

Original word: κατακλύζω
Transliteration: katakluzó
Definition (short): flooded
Definition (full): to inundate

NAS Exhaustive Concordance

Word Origin: from kata and the same as kludón
Definition: to inundate
NASB Translation: flooded (1).
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Strong's Exhaustive Concordance

From kata and the base of kludon; to dash (wash) down, i.e. (by implication) to deluge -- overflow.

see GREEK kata

see GREEK kludon

KJV: Whereby the world that then was, being overflowed with water, perished:
NASB: through which the world at that time was destroyed, being flooded with water.