subaquatic

listen to the pronunciation of subaquatic
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Located or living under water; submarine
being, formed, or operating under water
{a} being under water
{s} existing in water and on land, partly aquatic (Biology); relating or pertaining to underwater; subaqueous
Being under water, or beneath the surface of water; adapted for use under water; submarine; as, a subaqueous helmet
Formed in or under water; as, subaqueous deposits