Wiktionary
stereogenic
a. 1 (context chemistry physics English) describing a grouping of atoms in a molecule 2 # consisting of a central atom and four distinguishable ligands such that the interchange of any two leads to a stereoisomer 3 # consisting of four non-coplanar atoms such that rotation about the central bond leads to a stereoisomer 4 # consisting of a double bond with substituents which give rise to cis-trans isomerism