Delta :: Delta (n.) A tract of land shaped like the letter delta (/), especially when the land is alluvial and inclosed between two or more mouths of a river; as, the delta of the Ganges, of the Nile, or of the Mississippi..
Deltafication :: Deltafication (n.) The formation of a delta or of deltas.
Deltaic :: Deltaic (a.) Relating to, or like, a delta..