thorium /'θәuriәm/ 📖 中文释义 n. 钍[化] 钍Th 📘 English Definition(英文释义) n. a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands ← thorite T 字母词表 thorium anhydride →