thanato-youdaoicibaDictYouDict[thanato- 词源字典]
before vowels thanat-, word-forming element meaning "death," from Greek thanatos "death," from PIE *dhwene- "to disappear, die," perhaps from a root meaning "dark, cloudy" (compare Sanskrit dhvantah "dark"). Hence Bryant's "Thanatopsis", with Greek opsis "a sight, view."[thanato- etymology, thanato- origin, 英语词源]