Noun
severe and excessive vomiting
Source: WordNetThe source also brought up Middleton’s condition, hyperemesis gravidarum, which is an extreme form of morning sickness, and called it “life-threatening.” Source: Internet
When vomiting is prolonged, intractable, and interferes with nutrition and fluid intake, it is termed hyperemesis gravidarum (HG). Source: Internet
The statement also noted that the Duchess is suffering from Hyperemesis Gravidarum—a severe form of morning sickness— as she has done with her previous two pregnancies. Source: Internet
What Is Cannabinoid Hyperemesis Syndrome? Source: Internet