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Water | Definition of Water by Merriam-Webster

1 a: the liquid that descends from the clouds as rain, forms streams, lakes, and seas, and is a major constituent of all living matter and that when pure is an odorless, tasteless, very slightly compressible liquid oxide of hydrogen H 2 O which appears bluish in thick layers, freezes at 0° C and boils at 100° C, has a maximum density at 4° C ...

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