subaquatic, subaquatics 1. Partially aquatic; living or growing partly on land and partly in water: 'A marginal subaquatic flora.' 2. Growing or remaining under water. 3. Being under water, or beneath the surface of water; adapted for use under water; such as, a submarine or a subaqueous helmet. 4. Formed in or under water; such as, 'subaqueous ... Found on http://www.wordinfo.info/words/index/info/view_unit/2058/