Main Entry: ¹del·ta

Pronunciation: \ˈdel-tə\

Function: noun

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