Water
<B>1.</B> A tasteless odorless colorless liquid with the chemical formula H2O.<BR><B>2.</B> The liquid which forms rain, rivers, and the sea and makes up a large part of the bodies of most organisms, including humans.<BR><B>3.</B> The amniotic fluid, as in the bag of waters.<BR><B>4.</B> The cerebrospinal fluid, especially under increased pressure, as in water on the brain