delta

1. A low triangular area of alluvial deposits where a river divides before entering a larger body of water (synset 109287709)
   "the Mississippi River delta"; "the Nile delta"
   is a type of:

   • alluvial deposit, alluvial sediment, alluvion, alluvium - clay or silt or gravel carried by rushing streams and deposited where the stream slows down
   • formation, geological formation - (geology) the geological features of the earth
2. An object shaped like an equilateral triangle (synset 113902759)
   is a type of: equiangular triangle, equilateral triangle - a three-sided regular polygon
3. The 4th letter of the Greek alphabet (synset 106847508)
   is a type of: alphabetic character, letter, letter of the alphabet - the conventional characters of the alphabet used to represent speech
   belongs to: greek alphabet - the alphabet used by ancient Greeks

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