hyperemesis

noun
hy·​per·​eme·​sis | \ -ˈem-ə-səs How to pronounce hyperemesis (audio) , -i-ˈmē- How to pronounce hyperemesis (audio) \
plural hyperemeses\ -​ˌsēz How to pronounce hyperemeses (audio) \

Medical Definition of hyperemesis

: excessive vomiting