Isomereids

Isomereids is a term occasionally used in speculative chemistry or discussions of theoretical isomer spaces to describe a class of molecular species that arise from a common parent scaffold and are related by variations in connectivity or arrangement. It is not a standard term in established chemical nomenclature, and its precise definition can vary by author.

In typical usage, an isomereid refers to one member of an isomer family that preserves key geometric or topological features of the parent framework while differing in the placement of substituents, bonds, or ring closures. The concept emphasizes relational diversity among possible structures rather than a single, specific molecule.

Isomereids are sometimes invoked in computational chemistry, network analyses of isomer spaces, or speculative fiction to illustrate how a single framework might give rise to many isomeric forms. Because the term is not widely standardized, descriptions may differ and should be clarified in any given text.

See also: isomer, constitutional isomer, stereoisomer, enantiomer, diastereomer, isomer space.