|1.||the fourth letter in the Greek alphabet (Δ, δ), a consonant transliterated as d|
|2.||an object resembling a capital delta in shape|
|3.||(capital when part of name) the flat alluvial area at the mouth of some rivers where the mainstream splits up into several distributaries: the Mississippi Delta|
|4.||maths a finite increment in a variable|
|[C16: via Latin from Greek, of Semitic origin; compare Hebrew dāleth]|
delta del·ta (děl'tə)
Symbol δ, Δ The fourth letter of the Greek alphabet.
The fourth one in a series.
A surface or part that resembles a triangle, such as the terminus of a pattern in a fingerprint or the shape of a muscle.
Of or characterizing the atom or radical group that is fourth in position from the functional group of atoms in an organic molecule.
Of or relating to one of four closely related chemical substances.
Relating to or characterizing a polypeptide chain that is one of five types of heavy chains present in immunoglobins.
|delta (děl'tə) Pronunciation Key
A usually triangular mass of sediment, especially silt and sand, deposited at the mouth of a river. Deltas form when a river flows into a body of standing water, such as a sea or lake, and deposits large quantities of sediment. They are usually crossed by numerous streams and channels and have exposed as well as submerged areas.