Strong's Concordance

Original word: διθάλασσος
Transliteration: dithalassos
Definition (short): reef
Definition (full): divided into two seas, dividing the sea (as a reef)

NAS Exhaustive Concordance

Word Origin: from dis and thalassa
Definition: divided into two seas, dividing the sea (as a reef)
NASB Translation: where two seas met (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From dis and thalassa; having two seas, i.e. A sound with a double outlet -- where two seas meet.

see GREEK dis

see GREEK thalassa

KJV: And falling into a place where two seas met, they ran the ship aground; and the forepart stuck fast, and remained unmoveable, but the hinder part was broken with the violence of the waves.
NASB: But striking a reef where two seas met, they ran the vessel aground; and the prow stuck fast and remained immovable, but the stern began to be broken up by the force of the waves.