- delta [del′tə]n.[L < Gr delta, of Sem orig., as in Heb dāleth, 4th letter of the alphabet, lit., door]1. the fourth letter of the Greek alphabet (Δ, δ)2. something in the shape of a delta (Δ); specif., a tract of flat land, usually triangular, formed by deposits of soil and sand at the mouth of a large riveradj.1. [usually D-] of, in, or from the Delta [Delta blues]2. Chem. see ALPHA——————the Deltalow-lying region in NW Miss., extending eastward from the Mississippi Riverdeltaic [del tā′ik]adj.
English World dictionary. V. Neufeldt. 2014.