n 1 : the fourth letter of the Greek alphabet - symbol D or d 2 : any of various things felt to resemble a capital D : esp : 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
or d- adj 1 : of or relating to one of four or more closely related chemical substances <the delta chain of hemoglobin> <d-yohimbine> - used somewhat arbitrarily to specify ordinal relationship or a particular physical form and esp. one that is allotropic, isomeric, or stereoisomeric (as in d-benzene hexachloride) 2 : fourth in position in the structure of an organic molecule from a particular group or atom : also : having a structure characterized by such a position <d-hydroxy acids> <d-lactones> .
Similar sounding terms: dahll·ite de·lead delt de·lude
Published under license with Merriam-Webster, Incorporated. © 1997-2020.