
An oceanographic water mass is an identifiable body of water with a common formation history which has physical properties distinct from surrounding water. Properties include temperature, salinity, chemical - isotopic ratios, and other physical quantities. Common water masses in the world ocean are: Antarctic Bottom Water (AABW), North Atlantic De...
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http://en.wikipedia.org/wiki/Water_mass

body of ocean water with a distinctive narrow range of temperature and salinity and a particular density resulting from these two parameters. Water ... [2 related articles]
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http://www.britannica.com/eb/a-z/w/13

A mass of water that fills part of an ocean or lake and is distinguished by its uniform physical and
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http://www.encyclo.co.uk/local/22392

A mass of water that fills part of an ocean or lake and is distinguished by its uniform physical and chemical properties, such as temperature and salinity.
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http://www.scientificpsychic.com/etc/geology-glossary.html

A body of water that maintains its identity and can be characterized by such parameters as temperature and salinity
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https://www.encyclo.co.uk/local/20125

a body of seawater that shares the same origin. Each water mass has characteristic temperatures and salinities.
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https://www.encyclo.co.uk/local/21343
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