The story
From [Term?] + -prazole (“benimidazole derivative”).
Etymology from Wiktionary, CC BY-SA 4.0.
lansoprazole
Today it means: A particular proton pump inhibitor C₁₆H₁₄F₃N₃O₂S (trademark Prevacid) similar to omeprazole that prevents the stomach from producing acid. Full definition →