釷: 化學元素，符號為Th，原子序九十
釷，舊譯作釖、鋀，化學元素也，符號為Th，原子序九十。屬錒系元素、稀土金屬，富放射能。公元一八二八年，瑞典化學家貝采利烏斯偶得釷於挪威離島。
純釷色銀白，常溫性穩，光澤數月不去。而後漸次灰黑，蓋緩合於氧，化為二氧化釷故。純釷柔軟，善延展，可冷軋、引長。發煙硝酸、王水亟蝕之，濃鹽酸則緩。
其晶態有二：凡逾攝氏一千四百度者，呈面心立方；不足，則為體心立方。粉屑遇熱則燬，焰光亮白。
釷微存於天地，蓋雜於土石間。地殼之中，百萬者有十餘，二三倍於鈾也。
| 聲音動静，具錄於維基共享︰釷 |
譯名見異，臺譯在先，陸譯在後，香港兼從
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