Isopropyl alcohol is a chemical compound with the molecular formula C3H8O or C3H7OH. It is a colorless, flammable chemical compound with a strong odor. isopropyl alcohol n : alcohol used as antifreeze or a solvent [syn: {isopropanol}] Methanol, also known as methyl alcohol, wood alcohol, wood naphtha or wood spirits, is a chemical with the formula CH3OH (often abbreviated MeOH).