vermouth UK /vəˈmuːθ/US /vɚˈmuθ/ noun2 •A dry, or sweet apéritif wine flavored with aromatic herbs, and often used in mixed drinks.Earlier this year while in Madrid, I fell prey to what the Spanish call la hora del vermut, the vermouth hour, a break in the day for a glass, generally before eating. — 2023 •A serving of vermouth.As we sat over our vermuths he glorified the Company’s business, and by-and-by I expressed casually my surprise at him not going out there. — 1899 formsvermouths