delta

²delta

adj

Definition of DELTA

1

: of or relating to one of four or more closely related chemical substances <the delta chain of fetal hemoglobin> <ƍ-yohimbine>—used somewhat arbitrarily to specify ordinal relationship or a particular physical form and especially one that is allotropic, isomeric, or stereoisomeric (as in ƍ-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 <ƍ-hydroxy acids> <ƍ-lactones>

Variants of DELTA

delta or ƍ-