hyperreactor

noun

hy·​per·​re·​ac·​tor ˌhī-pər-rē-ˈak-tər 

variants or less commonly hyper-reactor

plural hyperreactors also hyper-reactors

: 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

Word History

First Known Use

1938, in the meaning defined above

Medical Definition

hyperreactor

noun

hy·​per·​re·​ac·​tor -rē-ˈak-tər 

variants also hyper-reactor

: a person who is abnormally sensitive (as to a stimulus or a drug) : one who is hyperreactive