chloramphenicol: an oral antibiotic (trade name Chloromycetin) used to treat serious infections (especially typhoid fever)
antibiotic: a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections
bayes' postulate: (statistics) the difficulty of applying Bayes' theorem is that the probabilities of the different causes are seldom known, in which case it may be postulated that they are all equal (sometimes known as postulating the equidistribution of ignorance)