SUBAQUATIC
semiaquatic, subaquatic
(adjective) partially aquatic; living or growing partly on land and partly in water; “a marginal subaquatic flora”
subaqueous, subaquatic, submerged, submersed, underwater
(adjective) growing or remaining under water; “viewing subaqueous fauna from a glass-bottomed boat”; “submerged leaves”
Source: WordNet® 3.1
Etymology
Adjective
subaquatic (not comparable)
Located or living under water; submarine.
Source: Wiktionary
Sub`a*quat"ic, Sub*a"que*ous, a.
1. Being under water, or beneath the surface of water; adapted for
use under water; submarine; as, a subaqueous helmet.
2. (Geol.)
Definition: Formed in or under water; as, subaqueous deposits.
Source: Webster’s Unabridged Dictionary 1913 Edition