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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

analgesic, anodyne, painkiller, pain pill go
a medicine used to relieve pain

morphine, morphia go
an alkaloid narcotic drug extracted from opium

apomorphine
a morphine derivative that is not as strong as morphine

noun.artifact

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