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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

local, local anesthetic, local anaesthetic, topical anesthetic, topical anaesthetic go
anesthetic that numbs a particular area of the body

ethyl chloride
a colorless flammable gas used as a local surface anesthetic

noun.artifact

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