Skip to definition.  Adjective: underwater  ,ún-du(r)'wor-tu(r)
1. Beneath the surface of the water     "underwater rocks";
- submerged, submersed   2. (biology) growing or remaining under
water     "viewing underwater fauna from a glass-bottomed boat";
- subaqueous, subaquatic, submerged, submersed Verb:
underwater  ,ún-du(r)'wor-tu(r)   1. (agriculture, horticulture)
to water or irrigate insufficiently  See also: aquatic,
subsurface  Encyclopedia: Underwater