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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

thing go
a separate and self-contained entity

unit, building block go
a single undivided natural thing occurring in the composition of something else

chain, chemical chain
(chemistry) a series of linked atoms (generally in an organic molecule)

noun.object

3 Subcategories

ring, closed chain go
(chemistry) a chain of atoms in a molecule that forms a closed loop
long chain, long-chain molecule go
(chemistry) a relatively long chain of atoms in a molecule
open chain go
a chain of atoms in a molecule whose ends are not joined to form a ring