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(Greek mythology) A Titan, the son of Uranus and Gaia, and father of Atlas, Prometheus, Epimetheus, and Menoetius.
(astronomy) The third largest moon of Saturn examples
(geology) An ancient ocean which existed between 600 and 400 million years ago. quotations
So, in the early Ordovician, Iapetus was wide enough to have one side in high latitudes and the other in the tropics: a massive ocean, indeed.
2004, Richard Fortey, The Earth, Folio Society, published 2011, page 184