Botulinum refers to a protein derived from nature, which today is used as a highly purified drug for the temporary, controlled relaxation of muscles in, among other things, aesthetics (wrinkle treatment), pain therapy (migraine, teeth grinding) and excessive sweating (hyperhidrosis).  The former term botulinum "toxin" dates back to the days of discovery > 200 years ago, when this protein was found in 100,000-fold doses in rotten sausage (Latin botulus = sausage) and should no longer be used today. This quantity would be absolutely unattainable today in purified form for financial and logistical reasons alone.