"The liquid which in a more or less impure state constitutes rain, oceans, lakes, rivers etc. and which in a pure state is transparent, odorless, tasteless liquid; a compound of hydrogen and oxygen, H20, freezing at 320 F. or 00 C. and boiling at 2121 F. or 1001 C. It contains 11. 118% hydrogen and 88.812% oxygen by weight.
(American College Dictionary, Random House)