'underwater' definitions:

Definition of 'underwater'

From: WordNet
adjective
Beneath the surface of the water; "submerged rocks" [syn: submerged, submersed, underwater]
adjective
Growing or remaining under water; "viewing subaqueous fauna from a glass-bottomed boat"; "submerged leaves" [syn: subaqueous, subaquatic, submerged, submersed, underwater]