viomycin: a basic polypeptide antibiotic (trade name Viocin) administered intramuscularly (along with other drugs) in the treatment of tuberculosis
antibiotic: a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections
vapor pressure: the pressure exerted by a vapor; often understood to mean saturated vapor pressure (the vapor pressure of a vapor in contact with its liquid form)