What is the definition or description of: water?

H2O: Water is the most abundant subtance on earth, making up the majority of all living organisms and a key to human health and survival. It is the happy union of two hydrogen ions and one oxygen.

Water: Is a chemical compound with the formula h2o, containing 1 oxygen & 2 hydrogen atoms. It is a liquid at temperatures above 0'c at sea level. It covers 71% of the earth's surface & is vital for all life forms. Drinking water is essential, even though it contains no calories & no organic nutrients. It is a universal solvent with many uses, such as drinking, agriculture, transportation, heat , etc.