[see-waw-ter, -wot-er]
the salt water in or from the sea.

before 1000; Middle English see water, Old English sǣwæter; see sea, water Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
seawater   (sē'wô'tər)  Pronunciation Key 
Salt water, normally with a salinity of 35 parts per thousand (3.5%), in or coming from the sea or ocean. Although seawater contains more than 70 elements, most seawater salts are ions of six major elements: chloride, sodium, sulfate, magnesium, calcium, and potassium. The major sources of these salts are underwater volcanic eruptions, chemical reactions involving volcanic matter, and chemical weathering of rocks on the coasts. Seawater is believed to have had the same salinity for billions of years.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Use seawater if fresh water supplies are low for all washing and sterilizing.
It can be raised in seawater, and thus doesn't deplete freshwater stocks.
Among other things, they were trying to keep the reactors cool by using
  fire-fighting equipment to spray seawater into the cores.
Huge amounts of seawater sink at known downwelling sites every winter, with the
  water heading south when it reaches the bottom.
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