Subaquatic
Pronunciation : Sub`a*quat"ic, Sub*a"que*ous
Part of Speech : a.
Definition : 1. Being under water, or beneath the surface of water; adapted for use under water; submarine; as, a subaqueous helmet.
2. (Geol.)
Defn: Formed in or under water; as, subaqueous deposits.
Source : Webster's Unabridged Dictionary, 1913