delta

¹del·ta

noun \ˈdel-tə\

Definition of DELTA

1

: the fourth letter of the Greek alphabet—symbol Δ or ƍ

2

: any of various things felt to resemble a capital Δ; especially : the triangular terminus of a pattern in a fingerprint formed either by bifurcation of a ridge or by divergence of two ridges that are parallel beyond it

3

: delta wave