Formed, situated, or occurring beneath the ocean or the ocean bed.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "suboceanic" in a sentence
"Like idly looking up the cost of a hundred-mile run of suboceanic fibre-optic or a Rosicrucian mummy (one of the mummies in the San Jose Rosicrucian Museum came out of an old Neiman-Marcus Christmas Book)."
"The rest of it is underwater or buried in the crust of the Earth, perhaps (some have speculated) exploiting the suboceanic magma as a source of energy."
"(Aside, Charlie told me about a story he's working on where the French suboceanic nuclear tests were actually aimed at exterminating the cthuloid sea-monsters -- which is why the Brits didn't really protest)"