[′meth·əl ′am·əl ′al·kə ‚hȯl] (organic chemistry) (CH3)2CHCH2CHOHCH3 Toxic, flammable, colorless liquid; boils at 132°C; miscible with water and most organic solvents; used as a solvent and as a chemical intermediate. Also known as methyl isobutyl carbinol (MIBC).