| botulinum toxin | (n) any of several neurotoxins that are produced by the anaerobic bacterium Clostridium botulinum; causes muscle paralysis |
| botulinum toxin a | (n) a neurotoxin (trade name Botox) that is used clinically in small quantities to treat strabismus and facial spasms and other neurological disorders characterized by abnormal muscle contractions; is also used by cosmetic surgeons to smooth frown lines temporarily, Syn. Botox |
| botulinus | (n) anaerobic bacterium producing botulin the toxin that causes botulism, Syn. Clostridium botulinum, botulinum |