thumb pianoBrE /ˈθʌm piænəʊ/ 🔊NAmE /ˈθʌm piænoʊ/ 🔊 (also sansa) nounan African musical instrument consisting of a row of metal strips, that you play with your fingers and thumbs 拇指钢琴（非洲乐器，由一排金属簧片组成）