is a Quenya
word meaning "the downfallen", from the verb-root talat-
Atalantë was the name given to Númenor after its Downfall. Tolkien called it "a happy accident", because it invokes the name Atlantis.
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Silmarillion, "Akallabêth: The Downfall of Númenor"