(noun) (Greek mythology) a river in hades ; the souls of the dead had to drink from it, which made them forget all they had done and suffered when they were alive
(noun) binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid ; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent
(noun) a liquid necessary for the life of most animals and plants