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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
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physical entity go
an entity that has physical existence
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thing go
a separate and self-contained entity
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unit, building block go
a single undivided natural thing occurring in the composition of something else
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molecule go
(physics and chemistry) the simplest structural unit of an element or compound
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macromolecule, supermolecule go
any very large complex molecule
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protein go
any of a large group of nitrogenous organic compounds that are essential constituents of living cells
opsin
retinal protein formed by the action of light on rhodopsin
noun.substance

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