WordNet (r) 3.0 (2006):

botulinum toxin A
    n 1: 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: botulinum toxin A,
         Botox]