What does emesis mean?
Emesis is the formal medical term for the act of vomiting — the forceful expulsion of the stomach's contents through the mouth. While everyday English relies on words like "vomiting" or "throwing up," clinicians, researchers, and pharmacologists favor "emesis" for its precision and neutrality: it describes the physiological event without colloquial overtones. The word appears frequently in medical writing, particularly in discussions of drug side effects, pregnancy-related illness (as in hyperemesis gravidarum), poisoning treatment, and anti-nausea therapy, where compounds such as "antiemetic" denote drugs that suppress it. Related clinical phrases include "inducing emesis" and "postoperative emesis." Derived from the ancient Greek verb for vomiting, the term has been part of learned medical vocabulary since antiquity's influence on Western medicine took hold. Though rarely heard outside professional settings, understanding "emesis" is valuable for anyone navigating health information, where it serves as the standard technical label for one of the body's most familiar reflexes.
nounThe act or process of vomiting; the discharge of stomach contents through the mouth.
- The act of vomiting; expulsion of stomach contents through the mouth (medical/clinical register).
"The patient experienced persistent emesis following chemotherapy and was prescribed an antiemetic."
"Nausea and emesis are among the most common side effects reported by patients undergoing chemotherapy."
"Activated charcoal may be administered to prevent absorption of the toxin rather than inducing emesis."
The plural follows the Greek-style -is → -es pattern shared with words like "thesis" and "nemesis." In practice the plural is rare, since emesis usually denotes an event or condition discussed in general terms.
"Recurrent emeses during her first trimester required hospitalization for fluid replacement."
Doctors say 'emesis' instead of 'vomiting' for the same reason lawyers say 'residence' instead of 'home' — a Greek coat of paint makes anything sound more professional.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of emesis
Emesis derives from the ancient Greek verb emein, meaning "to vomit," which itself traces back to the Proto-Indo-European root *wem- associated with spewing or vomiting. Greek medical writers such as Hippocrates and Galen used related forms in their clinical descriptions, and the term entered scholarly Latin before passing into English as part of the classical vocabulary of medicine. It shares its root with "emetic" — a substance that induces vomiting — and with compound medical terms such as "hematemesis" and "hyperemesis."
Related word forms
How emesis is actually used
"Emesis" is a formal, clinical term used almost exclusively in medical contexts — hospitals, pharmacology, research papers — and would sound stiff in everyday speech, where "vomiting" is standard. It carries a neutral, scientific connotation without the crudeness of informal alternatives like "puking."
Easily confused with emesis
Hematemesis refers specifically to the vomiting of blood, whereas emesis is vomiting in general.