/ · 1894 Brewer’s · D · Delta
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The island formed at the mouth of a river, which usually assumes a triangular form, like the Greek letter (Δ) called delta; as the delta of the Nile, the delta of the Danube, Rhine, Ganges, Indus, Niger, Mississippi, Po, and so on.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.