The word tannin, Genesis 1:21; Job 7:12; Ezekiel 32:2; and κῆτος Matthew 12:40; refer to any sea monsters, without defining any particular one. In the case of Jonah the Hebrew word is dag, or dagah, a fish; it may not have been a whale: sharks have been known to swallow men entire, and whatever fish it was that swallowed him, it was a miracle that preserved him alive, and caused him to be safely landed on shore again. It is only by denying the miracle that any difficulty arises. The Hebrew word tannin is also translated in the A.V. 'dragon,' 'sea monster,' and 'serpent.'
Originally published with the title A New and Concise Bible Dictionary by George Morrish (London), the Morrish Bible Dictionary is more than a dictionary of Bible words.Wikipedia
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