MSH: A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed),CSP: H2O; tasteless, colorless, odorless compound present in all organic tissues, and the most universal of solvents.,NCI: H2O, a clear, colorless, odorless, tasteless liquid that freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade.,NCI: Chemical compound that is liquid at room temperature and is composed two hydrogen atoms connected to an oxygen atom.