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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

causal agent, cause, causal agency go
any entity that produces an effect or is responsible for events or results

agent go
a substance that exerts some force or effect

drug go
a substance that is used as a medicine or narcotic

medicine, medication, medicament, medicinal drug go
(medicine) something that treats or prevents or alleviates the symptoms of disease

methacholine, Mecholyl
parasympathomimetic drug (trademark Mecholyl) that stimulates secretions and smooth muscle activity

noun.artifact

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