exo-ocean

noun

An ocean on a planet other than Earth.

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Meanings

nounexo-ocean (plural exo-oceans)

plural exo-oceans

  1. An ocean on a planet other than Earth.

    Before that day arrives, we might well find evidence of life in some of the exo-oceans much closer to home.

    2018 May 21, Tim Folger, “Our Aquatic Universe”, in Aeon, archived from the original on 17 Jun 2019
    1 more example

    From there, if the planet is big enough to gravitationally retain a thick atmosphere and is in the temperature zone where water can remain fluid, then you’ve got yourself an exo-ocean.

    2010 November 20, Steve Nerlich, Universe Today

Origin

From exo- + ocean.

Full word history & related roots →
Cite this entry
APA

exo-ocean. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/exo-ocean

MLA

“exo-ocean.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/exo-ocean. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “exo-ocean,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/exo-ocean.

Source: exo-ocean on Wiktionary, CC BY-SA 4.0.