Noun | 1. | Botox - 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 botulinum toxin - any of several neurotoxins that are produced by the anaerobic bacterium Clostridium botulinum; causes muscle paralysis |