Atlantis

UK: /ətˈlæntɪs/ US: (at lan′tis)

WordReference Random House Unabridged Dictionary of American English © 2026

At•lan•tis  (at lan′tis), n. 

1. Archaeology, Mythology a legendary island, first mentioned by Plato, said to have existed in the Atlantic Ocean west of Gibraltar and to have sunk beneath the sea, but linked by some modern archaeologists with the island of Thera, the surviving remnant of a much larger island destroyed by a volcanic eruption c1500 b.c. Cf. Akrotiri.

Collins Concise English Dictionary © HarperCollins Publishers::

Atlantis / ətˈlæntɪs/ noun

1. (in ancient legend) a continent said to have sunk beneath the Atlantic Ocean west of the Straits of Gibraltar