The Greek word “dithalassos”

Limited to Acts 27:41Acts 27:41
English: American Standard Version (1901) - ASV

41 But lighting upon a place where two seas met, they ran the vessel aground; and the foreship struck and remained unmoveable, but the stern began to break up by the violence of the waves.

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, the Greek adjective “dithalassos” meant “surrounded by two seas.”  Something like a reef or sandbar separated deep water on both sides of something.  The Exegetical Dictionary of the New Testament (1:324) suggested this may have been a “sandy bank extending in front of the actual shore.”