delta delta /ˈdɛltə/

noun

1. () A low triangular area of alluvial deposits where a river divides before entering a larger body of water  ( delta )
   a low triangular area of alluvial deposits where a river divides before entering a larger body of water
    The Mississippi River delta
   the Mississippi River delta
    The Nile delta
   the Nile delta
   
   
2. The 4th letter of the Greek alphabet  ( delta )
   the 4th letter of the Greek alphabet
   
3. An object shaped like an equilateral triangle  ( delta )
   an object shaped like an equilateral triangle