from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The area between the ocean's surface and the seabed.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun That part of the Earth, or other planet, that lie below the surface of its lakes, seas and oceans


Sorry, no etymologies found.


Help support Wordnik (and make this page ad-free) by adopting the word hydrospace.


  • And you have to hydrospace, shoot through hydrospace and you never know where you're going to come back.

    CNN Transcript Mar 4, 2009 2009

  • Work ranges from surveying and engineering in tidal and coastal areas to geomagnetic and hydrospace seismological observations.

    Discover What You’re Best At Linda Gale 1998


Log in or sign up to get involved in the conversation. It's quick and easy.