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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

molecule go
(physics and chemistry) the simplest structural unit of an element or compound

macromolecule, supermolecule go
any very large complex molecule

protein go
any of a large group of nitrogenous organic compounds that are essential constituents of living cells

antibody go
any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response

opsonin
an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes

noun.substance

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