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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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matter go
that which has mass and occupies space
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substance go
a particular kind or species of matter with uniform properties
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poison, toxicant, poisonous substance go
any substance that causes injury or illness or death of a living organism
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toxin go
a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species
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bacterial toxin go
any endotoxin or exotoxin formed in or elaborated by bacterial cells
anatoxin, toxoid
a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin
noun.substance

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