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
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“Hyperreactor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hyperreactor. Accessed 31 Oct. 2025.
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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
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