1) Aquatic 2) Subaquatic 3) Submerged 4) Submersed 5) Underwater 6) Used under water 1) Subaquatic 
• (a.) Formed in or under water; as, subaqueous deposits. • (a.) Being under water, or beneath the surface of water; adapted for use under water; submarine; as, a subaqueous helmet.
[adj] - (biology) growing or remaining under water
subaqueous 1. Formed or adapted for underwater use or operation; submarine. 2. Found or occurring underwater: subaqueous organisms; subaqueous rocks. 3. Existing or situated under water; used underwater.
subaquatic 2 submerged 2 submersed 2 underwater adjective growing or remaining under water; `viewing subaqueous fauna from a glass-bottomed boat`; `submerged leaves`
existing or situated under water; underwater. · occurring or performed under water. · used under water.