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From [Term?] + -pitant (“neurokinin NK₁ receptor antagonist”).
Etymology from Wiktionary, CC BY-SA 4.0.
aprepitant
Today it means: An antiemetic drug C₂₃H₂₁F₇N₄O₃ taken orally to prevent nausea and vomiting occurring as a consequence of cancer chemotherapy or surgery. It acts as an antagonist of receptors for substance P. It is often taken in combination with other antiemetic drugs and is marketed under the trademark Emend. Full definition →