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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

anesthetic, anaesthetic, anesthetic agent, anaesthetic agent go
a drug that causes temporary loss of bodily sensations

spinal anesthetic, spinal anaesthetic go
an anesthetic that is injected into the spine

piperocaine, piperocaine hydrochloride, Metycaine
a compound used in the form of its hydrochloride as a local or spinal anesthetic

noun.artifact

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