seawater

adj. of or pertaining to salt water from the sea

n. salt water which comes from the sea or ocean

Seawater is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of ~3.5%, or 35 parts per thousand. This means that every 1 kg of seawater has approximately 35 grams of dissolved salts (mostly, but not entirely, the ions of sodium chloride: Na+, Cl-). The average density of seawater at the surface of the ocean is 1.025 g/mL; seawater is denser than fresh water (which reaches a maximum density of 1.000 g/mL at a temperature of 4°C) because of the added weight of the salts and electrostriction.
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Noun
1. water containing salts; "the water in the ocean is all saltwater"
(synonym) saltwater, brine
(hypernym) water, H2O
(hyponym) red tide
(substance-meronym) bromine, Br, atomic number 35

A special class of saltwater muds in which sea water is used as the fluid phase
  

ACQUA MARINA. ACQUA SALATA