hematemesis

noun
he·​ma·​tem·​e·​sis
variants: or chiefly British haematemesis \ ˌhē-​mə-​ˈtem-​ə-​səs also ˌhē-​mə-​tə-​ˈmē-​səs \
plural hematemeses\ -​ˌsēz \

Medical Definition of hematemesis 

: the vomiting of blood

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