del·ta 
/ˈdɛltə/ noun
plural del·tas /ˈdɛltə/ noun 1 [count] : the fourth letter of the Greek alphabet — Δ or ƍ 2 [count] : a piece of land shaped like a triangle that is formed when a river splits into smaller rivers before it flows into an ocean
▪ a river delta ▪ the Ganges/Nile Delta 3 or Delta [singular] US : an area of low land along the Mississippi River that is mainly in the state of Mississippi
▪ the Mississippi Delta ▪ delta blues [=blues music that comes from the Mississippi delta]
▪ a river delta ▪ the Ganges/Nile Delta
▪ the Mississippi Delta ▪ delta blues [=blues music that comes from the Mississippi delta]
