say it: UHN-dur-waw-tur
underwater is an adjective meaning "beneath the surface of the water". It carries 2 recorded senses.
growing or remaining under water
“viewing subaqueous fauna from a glass-bottomed boat”
“submerged leaves”
biology
Definitions, synonyms and semantic relations for underwater come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.