hyperreactor

noun
hy·​per·​re·​ac·​tor | \ˌhī-pər-rē-ˈak-tər \
variants: or less commonly hyper-reactor
plural hyperreactors or hyper-reactors

Definition of hyperreactor 

: a person who is abnormally sensitive (as to a stimulus or a drug) : one who is hyperreactive spiking of blood pressure in hyperreactors following exposure to cold

First Known Use of hyperreactor

1938, in the meaning defined above

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The first known use of hyperreactor was in 1938

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hyperreactor

noun
hy·​per·​re·​ac·​tor | \-rē-ˈak-tər \

Medical Definition of hyperreactor 

: one who is hyperreactive (as to a particular drug)

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