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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 go
(chemistry) a series of linked atoms (generally in an organic molecule)

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

noun.object

2 Subcategories

branched chain go
an open chain of atoms with one or more side chains attached to it
straight chain go
an open chain of atoms with no side chains