[suhb-ey-kwee-uhs, -ak-wee-]
existing or situated under water; underwater.
occurring or performed under water.
used under water.

1670–80; sub- + aqueous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
subaqueous (sʌbˈeɪkwɪəs, -ˈækwɪ-)
occurring, appearing, formed, or used under water

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
subaqueous   (sŭb-ā'kwē-əs)  Pronunciation Key 
  1. Found or occurring underwater.

  2. Formed or adapted for underwater use or operation.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Of the set of five wall switches, one alone was operational, producing a thin subaqueous light.
The room, which had descended into a subaqueous silence emanating from the corpse, is now fiercely active.
They point both downward and upward, with the descending hands meeting to form the shape of a skull in a subaqueous twilight.
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