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| sonic depth finder |
an instrument that uses sonar to measure underwater depths. |
| sonobuoy |
a buoy that receives and amplifies underwater sound signals and transmits them by radio. |
| sponge |
any of various aquatic animals with a porous body and a tough fibrous or calcareous skeleton formed of irregular clumps or branched masses that are attached to underwater surfaces. [1/10 definitions] |
| subaqueous |
designed, formed, or adapted for life or use under water; underwater. [1/2 definitions] |
| tamarack |
the wood from these trees, used esp. for underwater construction, as of piers or docks. [1/2 definitions] |
| tidal wave |
an unusual rise or incursion of the sea, caused by an underwater quake, a hurricane, or the like; tsunami. [1/2 definitions] |
| torpedo |
any of various devices designed to explode underwater, esp. a submarine mine. [1/6 definitions] |
| tunnel |
an underground or underwater passageway, as for a railroad through a mountain or for a road under a river or city. [1/6 definitions] |
| ultrasonography |
the use of high-frequency sound waves to image a fetus, internal body structures, or objects that are underwater. |
| undersea |
pertaining to, located, carried on, or intended for use beneath the surface of the sea; underwater. [2 definitions] |
| water glass |
a tube or box with a glass bottom, used for underwater observation. [1/4 definitions] |
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