open-chain

[LeeTot]

having an open chain structure

[Williamorect]

a chain of atoms in a molecule whose ends are not joined to form a ring

[KalanNug 0]

Open-chain refers to a structure, usually in chemistry, where constituents are connected in a line or branched sequence rather than forming a loop or ring. Commonly related to organic compounds such as alkanes, alkenes, and alkynes, open-chain compounds are also known as acyclic compounds.